除了在骨头上写字,中国人还在龟壳上做标记。
In addition to writing on bones, the Chinese also made marks on turtle shells.
为什么在书上做标记是必要的?因为它会让你保持清醒。
Why is marking a book necessary? Because it keeps you awake.
知道如何在书上做标记是一个非常重要的学习技巧。
An extraordinarily important study skill is knowing how to mark a book.
One way to mark time is to imagine it carries a clock as it moves, and put markers every second.
标记时间的一种方法是,想像它带着时钟运动,并且每秒做一次标记
What am I doing? I'm creating a list with just that special symbol none in it.
我在做什么?,我只是在创建一个,有着特殊标记。
So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.
我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方
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