only by improving ourselves can we meet better

正确的,这是only 加介词短语作状语,提前,后边句子用部分倒装.意思是：只有拯救了环境,我们才能拯救自己.再来一个例句：Only in this way can you make progress in your English listening.还可以接从句也是一个原则,如：only after he finished his work was he allowed to go out.

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