It's a general thing; it's around that time is the best we can really say.

这只是大概的时间,是我们根据证据的推测

耶鲁公开课 - 古希腊历史简介课程节选

I just give you one of those, right, because you could write down the other one because you know the other complimentary sequence from base pairing?

我只写了一条链的序列,因为你们能够写出另一条,因为你们根据碱基配对,就能推测出互补链的序列

耶鲁公开课 - 生物医学工程探索课程节选