看着宝贵的时间被浪费真是令人沮丧。

It's frustrating to watch valuable time being wasted.

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It's frustrating to watch valuable time being wasted.

frustrating 是形容词,由动词 frustrate(使沮丧、挫败)加上 -ing 后缀构成,表示"令人沮丧的、使人挫败的"。

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