lucky; by luck; by a fluke
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我侥幸通过了考试。
By good luck I was able to pass the examination.
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他侥幸夺冠。
He fluked his way into the championship.
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侥幸取胜
gain/win victory through/by sheer good luck; win by a fluke
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侥幸成功
have the luck to succeed
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侥幸避开
avert narrowly