论文部分内容阅读
小时候,每当早晨见到草叶上晶亮的露珠,我就感到很奇怪:昨夜又没有下雨,草叶上的露珠是从哪里来的呢?
When I was young, I was surprised to see the bright dew on the blades of grass in the morning: there was no rain last night, where did the dew on the blades of grass come from?