Then you should not be irritated, Mary, because the dog does not know it is wrong to play with your toy.
那么玛丽,你不应该生气,因为狗不知道玩你的玩具是不对的。
At his age, he should know it is wrong.
在他这个年龄,他应该知道这是错误的。
Sometimes know it is wrong, but also without hesitation.
有的时候明知道做下去是错的,但是还要义无反顾。
He needs to know about the structures of the molecules, because if the structure is wrong it's not going to work.
他想要让它们成键,他需要知道分子结构,因为如果结构不对。
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