几乎每天你都能看到进步和成就，不过请记住，人各不同，有些人会比别人进步得快。

Almost daily you can see progress and accomplishment. Keep in mind, however, that all people are different and some may progress faster than others.

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The trouble is, you just don't know when that explosion took place, and since there are several periods in this general area that we're talking about now, in which something big happened, some great change takes place, it turns out different people want to have their explosion at different times.

问题是,你不了解火山爆发的,确切时间以及这种爆发,在这个区域又延续了很多个时期,这些时期发生了许多重大事件和重大变化,结果就是不同人对,火山爆发的时间推测各不相同

耶鲁公开课 - 古希腊历史简介课程节选

So, you have to imagine that this thing started with these guys back in their camp and the other army back in its camp, and they both have to agree that they want to have a battle, for a battle to take place, and they will have picked a place that is flat where they can do what they're doing.

所以事情是这样的,你得想象一下,一群人各属于不同阵营,他们都同意开战,为了进行战斗,他们需要挑选一块平地,以供双方的方阵摆开架势

耶鲁公开课 - 古希腊历史简介课程节选