only [ˈəʊnli]

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adv.仅仅，只不过；adj.唯一的；conj.可是，不过

used to show that there is a single one or very few of something, or that there are no others

We have only one earth. 我们只有一个地球。
I only found it by accident. 我只是碰巧找到的。