清凉可口的西瓜人人都爱吃，我也不例外，但是我一次吃西瓜的时候，却有了一个发现。
Everyone likes to eat the cool and delicious watermelon, and I am no exception, but when I eat watermelon once, I have a discovery.
今年夏天，妈妈买了一个大西瓜。这个西瓜又大又圆，活像一个大皮球。我们迫不及待地把它切开，我发现它的皮是绿油油的，里边却红彤彤的。这是为什么呢?于是我放下手中的西瓜，去查《少儿百科全书》，终于我找到了答案。
This summer, my mother bought a big watermelon. The watermelon is big and round, like a big ball. We can't wait to cut it open. I find its skin is green, but it's red inside. Why? So I put down my watermelon and went to look up the Encyclopedia of children, and finally I found the answer.
原来，西瓜的表皮有叶绿素，为了吸收阳光。但它里面吸收了阳光，成熟后就变成红色的了。
Originally, watermelon's epidermis has chlorophyll, in order to absorb sunlight. But it absorbs sunlight and turns red when it matures.
一个普通的西瓜里都有这么多的知识!生活中往往隐藏着无穷的知识，等着善于观察，努力探究的人去发现。
There are so many knowledge in a common watermelon! Life often hides infinite knowledge, waiting for those who are good at observation and hard to explore to find out.