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The climbers face certain death if the rescue today is unsuccessful.
救援行动如果今天不能成功，登山队员必死无疑。
《牛津词典》
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They face certain death unless they can be rescued today.
他们除非今天获救，否则必死无疑。
youdao
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They face certain death unless they can be rescued today.
他们除非今天获救，否则必死无疑。
youdao