驻扎在一个以一辆小型面包车为标志的临时检查站的安全部队挥手示意我们通过。

Security forces at a impromptu checkpoint marked by a small minibus wave us by.

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地球历史上的这次重大灾难以物种的大量消亡为标志；当时，地球上多达一半的物种都灭绝了。

This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.

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而是一种以甲烷和乙烷为标志的烃类物质的大气循环。

It is instead an exotic climate of hydrocarbons that features methane and ethane.

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We're talking about a culture when we're talking about the Greeks, which is most strikingly signified by the language that is spoken.

当我们谈论希腊人时我们是谈论希腊文化,是严格以所使用的语言为主要标志的

耶鲁公开课 - 古希腊历史简介课程节选

If you would like to flag them as private, because you just don't want your classmates to see what you're asking, you can certainly do that.

如果你想要把它们标志为私有的，不想让你的同学们,看到你问的问题，你当然也可以这样做。

哈佛公开课 - 计算机科学课程节选