他怀着极大的热忱开始了新工作。

He started his new job with great earnestness.

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He started his new job with great earnestness.

earnestness 是形容词 earnest 的名词形式,earnest 意思是"认真的、热忱的"。加上名词后缀 -ness 后,表示"认真、热忱"的状态或品质。

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