可是，你有没有想过一个特别有趣的问题呢？树叶，为什么偏偏是绿色的呢？它为什么不是红色的，像草莓一样？为什么不是黄色的，像小鸭子的绒毛？或者蓝色的，像晴朗的天空？这里面啊，藏着一个天大的秘密，一个关于阳光、魔法和生命的小小奇迹。
But have you ever thought about a really fun question? Why are leaves green? Why aren't they red, like strawberries? Why aren't they yellow, like a duckling's soft feathers? Or blue, like a clear sky? There's a big secret hidden here—a little miracle about sunlight, magic, and life.
让我们先来玩一个游戏吧！找一个阳光特别好的日子，最好是下午，太阳公公笑眯眯地看着大地的时候。你跑到一棵大树下，抬起头，眯起眼睛，透过那些密密的树叶往天上看。
Let's play a game first! Find a day when the sun is shining brightly, especially in the afternoon, when the sun is smiling down on the earth. Run under a big tree, look up, squint your eyes, and peek through the thick leaves at the sky.
你看到了什么？是不是感觉光线变得柔和了，不那么刺眼了？那些阳光，好像被树叶筛过了一样，变成了点点闪闪的金色光斑，在地上跳来跳去。
What do you see? Does the light feel softer now, not so bright anymore? The sunshine seems to be filtered through the leaves, turning into little golden sparkles that dance around on the ground.
这时候，你再低头看看自己的手，或者看看树下的草地，咦，是不是好像也染上了一点淡淡的绿色？哈哈，这可不是你的眼睛花了，这是树叶在和你玩捉迷藏呢！
Now, look down at your hands, or at the grass under the tree. Hmm, do they seem to have a light green color too? Haha, it's not your eyes playing tricks on you—it's the leaves playing hide-and-seek with you!
其实啊，太阳公公送来的光，并不是只有一种颜色。它是个超级厉害的“魔术师”，手里拿着一道看不见的“彩虹”。这道彩虹里有红色、橙色、黄色、绿色、蓝色、靛色、紫色…好多好多颜色混在一起，就成了我们平时看到的、白花花的阳光。
You know, the light from the sun isn't just one color. The sun is like a super amazing magician, holding an invisible rainbow in its hands. This rainbow has red, orange, yellow, green, blue, indigo, purple... so many colors all mixed together, and that's what makes the bright, white sunlight we see every day.
当这道“阳光彩虹”跑到树叶上的时候，有趣的事情就发生了。每一片小小的树叶，里面都住着成千上万个更小更小的“魔法工厂”，它们有一个好听的名字，叫“叶绿体”。听名字就知道，它们肯定和绿色有关，对吧？
When this "sunshine rainbow" reaches the leaves, something magical happens. Inside each tiny leaf, there are thousands and thousands of even tinier "magic factories." They have a lovely name—chloroplasts. Just from the name, you can tell they must have something to do with green, right?
这些叶绿体啊，就像是树叶里一个个微小的、绿色的“太阳能电池板”。它们最喜欢的，就是阳光里的蓝色光和红色光。
These chloroplasts are like tiny, green "solar panels" inside the leaves. They love the blue light and red light from the sunshine the most.
当阳光照在树叶上，叶绿体里的“小工人”——一种叫叶绿素的魔法物质，就会“嗖”地一下，伸出小手，把阳光里的红光和蓝光牢牢地抓住，吸收进来！“嘿！红光能量大，抓住！”“哇！蓝光也不错，别跑！”这些小工人可忙坏了。
When sunlight shines on the leaves, the "little workers" inside the chloroplasts—a magical substance called chlorophyll—quickly reach out their tiny hands and grab the red and blue light from the sunlight, absorbing it all! "Hey! Red light has lots of energy, grab it!" "Wow! Blue light is great too, don't let it go!" These little workers are so busy!
那…绿光呢？哎呀，绿光就有点可怜啦。叶绿素小工人们好像对绿光不太“感冒”，觉得它的能量不太合自己的胃口。于是，它们就把绿光…“砰”地一下，给弹开啦，或者让它穿过去了。
What about... the green light? Oh, the green light is a bit unlucky. The little chlorophyll workers don't seem to "like" the green light very much. They think its energy doesn't quite suit their taste. So, they just... "boing!" bounce it away, or let it pass right through.
这被弹开或者穿过去的绿光，跑到了我们的眼睛里，我们一看：“哦！这片叶子是绿色的！”所以，树叶是绿色的，并不是因为它“是”绿色，而是因为它“不要”绿色！
The green light that bounces off or passes through comes into our eyes. When we look, we say, "Oh! This leaf is green!" So, leaves are green not because they "are" green, but because they "don't want" green!
它把绿色的光扔给了我们，让我们看到了绿色。这就像你有一盒彩色蜡笔，你最喜欢用红色和蓝色画画，把绿色的蜡笔放在一边不用。别人看到你的画盒，就会说：“你的绿色蜡笔最多！”其实不是你最喜欢绿色，而是你总不用它呀！
It threw the green light to us, so we could see green. It's like having a box of colorful crayons. You love using red and blue to draw, but you leave the green crayon aside. When others see your crayon box, they might say, "You have so many green crayons!" But it's not that you like green the most—it's just that you never use it!
你可能会问，树叶为什么要这么“挑食”呢？只吃红光和蓝光，多浪费呀！这可一点都不浪费，这恰恰是世界上最最重要的工作！
You might wonder, why are leaves so picky? They only eat red and blue light—what a waste! But it's not wasteful at all. In fact, it's the most important job in the whole world!
树叶抓住这些光，可不是为了好玩。它是在进行一场静悄悄的、伟大的“魔法烹饪”，名字叫做“光合作用”。听这个名字，“光合作用”，光、合、作用，就是把光“合”起来产生作用。
Leaves catch the sunlight, but not just for fun. They are quietly doing a great "magic cooking" called photosynthesis. Listen to the name, photosynthesis—photo, synthesis, action. It means using light to create something special.
叶绿体这个魔法工厂，用吸收来的阳光当能量，把从树根喝上来的水，和从空气中吸收的、一种叫二氧化碳的气体（就是我们呼出来的气里就有的那种），放在一起，叮叮当当，变！魔！法！猜猜变出了什么？
Chloroplast is a magic factory. It uses sunlight as energy. It takes water from the roots and a gas called carbon dioxide from the air. That's the same gas we breathe out! It mixes them together and... Abracadabra! Magic! Can you guess what it makes?
第一样，是甜甜的“食物”——葡萄糖。这就是大树自己的点心，它靠这个长大，长高，变得壮壮的。结出苹果、梨子、桃子，里面甜甜的味道，最早都是从这片小小的绿叶里变出来的呢！
First, there is sweet "food"—glucose. This is the tree's own snack. It uses this to grow tall and strong. The sweet taste inside apples, pears, and peaches all starts from these little green leaves!
第二样，更了不起了，是氧气！就是我们每天呼吸，离不开的、新鲜的氧气。树叶就像一个个小小的绿色工厂，默默地为地球上所有的动物，包括我们人类，制造着呼吸需要的空气。你深深吸一口树林里清新的空气，那里面就有树叶刚刚送出来的礼物哦！
The second thing is even more amazing—it's oxygen! That's the fresh air we breathe every day, and we can't live without it. Leaves are like tiny green factories, quietly making the air that all animals on Earth, including us humans, need to breathe. When you take a deep breath of the fresh air in the forest, you're breathing in a gift that the leaves have just made for you!
所以，树叶是绿色的，这个看似简单的事情，背后连着一整条生命的链条。没有这个绿色，大树就没有能量，就不能为我们制造食物和空气了。当然啦，大自然这个画家，偶尔也会换换颜色。
So, leaves are green. This simple thing is connected to a whole chain of life. Without this green, trees wouldn't have energy, and they couldn't make food and air for us. Of course, nature is like a painter who sometimes likes to change colors.
比如，到了秋天，天气变凉，白天变短。树叶里的叶绿素小工人们觉得“假期”要到了，它们慢慢分解，消失了。这时候，一直被绿色掩盖的其他颜色，就偷偷跑出来啦！
For example, when autumn comes, the weather gets cooler and the days become shorter. The little chlorophyll workers inside the leaves think their "vacation" is about to start, so they slowly break down and disappear. Then, the other colors that were hidden by the green sneak out to play!
有的树叶里有黄色的“胡萝卜素”（对，就是胡萝卜里那种橙黄色的东西），有的树叶里有红色的“花青素”（像葡萄、紫甘蓝里的颜色）。于是，我们就看到了金灿灿的银杏叶，火红火红的枫叶，把秋天打扮得五彩斑斓。
Some leaves have yellow "carotene" inside—yes, just like the orange color in carrots! Other leaves have red "anthocyanin," like the colors in grapes and purple cabbage. That’s why we see golden ginkgo leaves and bright red maple leaves, making autumn look so colorful and beautiful!
不过，那又是另一个关于休息和准备的美妙故事了。
But that's another wonderful story about resting and getting ready.
现在你明白了吗？树叶是绿色的，是因为它身体里住着无数个勤劳的叶绿素小工人。它们忙着捕捉阳光里的红色和蓝色，用来进行神奇的“光合作用”，为自己制造食物，也为整个世界制造氧气。而被它们“拒绝”的绿光，反射到我们眼睛里，就让我们看到了满世界生机勃勃的绿色。
Now do you understand? Leaves are green because inside them live countless hardworking little workers called chlorophyll. They are busy catching the red and blue light from the sun to do a magical thing called "photosynthesis." This helps them make food for themselves and also creates oxygen for the whole world. The green light they "refuse" bounces back to our eyes, and that's why we see the whole world full of lively green.
下次你再看到一棵大树，一片绿叶，不妨轻轻摸摸它，对它说声谢谢吧。谢谢它用绿色的身影，装点了我们的世界；更谢谢它默默无闻的工作，带来了甜美的果实和清新的空气。这一抹绿色，不只是颜色，它是阳光的诗句，是生命的魔法，是我们星球上最动人的秘密之一。看，窗外的树叶又在风里沙沙作响了，它们是不是在说：“嘿，小朋友，我们的秘密，你现在知道啦！”返回搜狐，查看更多