我们非常努力地想发动那辆旧车,但所有的努力都失败了。

We tried very hard to start the old car, but all our efforts were unsuccessful.

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We tried very hard to start the old car, but all our efforts were unsuccessful.

unsuccessful 是由前缀 un-(表示“不、非”)和形容词 successful(成功的)组成的形容词,意思是“不成功的、失败的”。

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