建议寻求亲笔签名的影迷们在活动开始前排好队。

It is advised that fans seeking autographs join the line before practice starts.

《柯林斯英汉双解大词典》

这种想法出现于公元1800年左右，当时人口变得足够多，大约有10亿人，人类的活动开始能够改变环境。

The idea is that around the year 1800 CE the human population became large enough, around a billion people, that its activities started altering the environment.

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他的竞选活动开始较迟。

His campaign got off to a late start.

《柯林斯英汉双解大词典》

Rather, the pauses are inserted by your mind as you already know where one word begins and another one ends.

相反,停顿只是由你的心理活动插入的,因为你已经知道了一个单词的开始,与另一个单词的结束在什么地方

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And you just start coming to events, and that's usually how it happens.

然后你就开始参加他们的活动，就是这样。

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Because it was in the 1950's or so, maybe the late 1940's, that people started to discover lithium, even though it had no natural function, it did do something in our bodies.

因为在二十世纪五十年代左右，可能是四十年代末期，人们开始发现锂，尽管不参与人体的正常生理活动，但是它确实会对我们的身体产生影响。

麻省理工公开课 - 化学原理课程节选