He applied himself diligently to learning French.
他孜孜不倦地学法语。
He applied himself diligently to learning French.
他孜孜不倦地学法语。
Although he is in poor health, he still perseveres in his studies.
尽管他身体不好, 他仍孜孜不倦地学
。
：以
例
、词
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