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。
But when I have finished, if the solution is not beautiful, I know it is wrong.
但当我完成以后,如果这个解决方案是不美的,我知道这个方案一定是错误的。
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。
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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