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1·She can be as stubborn as a mule.

她可以倔得像头骡子。《牛津词典》

2·He's as stubborn as a mule.

他像骡子一样倔。《牛津词典》

3·It's useless to persuade him, he is as stubborn as a mule.

劝他是没用的，他非常固执，就像骡子一样。

4·Maybe you should give up. You know, he is as stubborn as a mule.

你也许应该放弃，你知道的，他很顽固。

5·What do you mean I'm as stubborn as a mule? When ot comes to being stubborn, you take the cake!

你竟然说我像骡子一样顽固？说起顽固，你才是冠军呢！

6·You can take that as a positive or negative of mine, but I'm stubborn as a mule.

你可以把这当作对我的褒奖或者是贬低，但我的确犟的像头驴。