Documentaries provide plenty of information about a certain subject, but when I'm tired I don't want to think too much.

纪录片提供了关于某个主题的大量信息，但当我累的时候，我不想思考太多。

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This means that any thought about a certain subject will often bring up more memories that are related to it.

这就意味着任何关于某一主题的想法通常会勾起更多与之相关的记忆。

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If you are really very weak at or interested in a certain subject, maybe it's OK for you.

如果你真的在某个科目很弱或感兴趣，也许这对你是好的。

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Even this blogger is often emailed by ethically challenged marketing types promising payment for writing about a certain subject or guest-posting their pre-fabricated story.

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And they were asked to review intelligence reports on a certain subject, which they did, which is a perfectly proper thing for policy people to do.

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We put them on an education assembly line every day, starting with one station that teaches them a certain subject before automatically moving them to the next class after a certain period of time.

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