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In 1969 when Neil Armstrong said “That’s one small step…”, he made a lasting impression.
1969年，當時阿姆斯特朗的名言“人類一小步”給人留下了難以磨滅的印象。
On the moon, that is. Marks on the surface of the moon don’t disappear the way marks on the Earth do; a great example is the impact craters we can see dotting the moon’s surface.
月球表面也是這樣。其表面的記號不會像地球那樣輕易消失。最典型的例子就是人類肉眼可見的月球表面密密麻麻的隕石坑。
Many of them are billions of years old!
其中很多隕石坑的歷史長達數十億年。
But Why?
為什么呢？
If you write your name in the sand at the beach, one day later there’s no sign you were there. What’s the difference?
如果你在沙灘上寫下自己的名字，那么一天后，名字就會消失。兩者的差別在哪呢？
Here’s an experiment you can do to find out. Take two pans and fill them with soil and sand mixed together.
你可以利用實驗尋找差別。首先準備兩口平底鍋，再將土和沙子摻在一起裝進鍋里。
Now have some young person press her or his hand down into the mixture to make an imprint.
然后讓幾個年輕人把手放在沙土中留下印記。
One of these surfaces will represent the Earth, and one the moon.
其中一口平底鍋代表地球，另一口代表月球。
譯文為可可英語翻譯，未經授權請勿轉載!
