跟踪者则知道你的生日，你将要去哪里，你鞋子的尺码，你昨天穿什么，前天穿什么。
A stalker knows your birthday, where you're going to be, your shoe size, what you wore yesterday and the day before.
我们可以认定的情况是这样的：他知道自行车这个词语，也知道我有一辆，因为他前天看见我骑车来到这里。
We established that: yes, he knew what a bisiklet was; and, yes, he knew that I had one because he had seen me cycling into town the previous day.
很多年以前天文学家就已经知道，有些星系的组成中没有任何一颗新形成的星体，它们都是由一些年代十分久远的恒星组成的。
Astronomers have also known for years that some large galaxies don't seem to be forming any new stars; they are full of aging SUNS.
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