Her hair could have done with a wash.

她的头发该洗一洗了。

《牛津词典》

His design was infinitely better than anything I could have done.

他的设计比我所能设计的不知要好上多少倍。

《柯林斯英汉双解大词典》

In sports and many areas of life, we think of failures as evidence of something we could have done better.

在体育运动和生活的许多领域，我们认为失败是我们本可以做得更好的佐证。

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