You always have to get worried in history when people start talking about how human beings or human behavior is rooted in nature.
当你了解那段历史中的人们在讨论,某些人类或者人类行为是天性使然时,你会为此担忧
Or in situations where you have concern for your safety or for other's safety.
或者当你在为自己或他人的安危感到担忧时,都可以使用这个句型。
or if you're concerned about someone.
或者当你担忧某人时,也可以使用这个句型。
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