在我们还很小的时候,就常常会遇到别人问这样一个问题:在我们中国人的脚下,地球的那一边是什么地方?有人会不假思索地、颇为自豪地回答:美国!我们这里是白天,他们那里是黑夜。”现在我们知道这个答案是不对的。其实寻找“和我们脚对脚的那一端”是一个很有趣的问题,要用到自然 When we were very young, we often met people asking such a question: At the foot of our Chinese people, where is the Earth’s side? Someone would answer without hesitation and with pride: The United States! We are here. During the day, they are there in the dark. “Now we know that this answer is wrong. In fact, looking for ”the end of our foot to the foot" is a very interesting issue. We must use nature.