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His writing gained by continuous practice.
由于经常练习, 他的写作水平提高了。
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He gained entry into the building by means of a bribe to the guard.
他通过贿赂卫兵而获准进入大楼。
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What have I to gain by staying here?
我呆在这儿有什么好处可图?
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There is nothing to be gained by waiting any longer.
再等待也没有什么好处。