impossible to guard against ...;impossible to defend effectively;no way to prevent [guard against] absolutely;Precautions cannot ward off sudden attacks. ;

His opponent couldn't stand up to his varied and fast-changing tactics.
他球路多变,令对手防不胜防.
来源:《现代汉英综合大词典》While you trust to the dog, the wolf slips into the sheepfold.
当你认为狗可信, 狼已偷偷把羊圈进.老虎也有打盹的时候;防不胜防.
来源:互联网摘选进入网络时代, 信息传播极快, 总统候选人对谣言防不胜防.
来源:互联网摘选When all three are on court, the opponents are having hard times in their defense.
当他们三人同时在场上的时候, 令对手防不胜防.
来源:互联网摘选Hearn felt himself being harassed , then threatened, then strangled.
侯思只觉得自己防不胜防, 不一会儿就岌岌可危了, 再一会就走投无路了.
来源:词典精选例句Letters of credit in terms of soft Fangbushengfang today, this warning also applies to the seller.
在信用证软条款防不胜防的今天, 这一告诫同样适用于卖方.
来源:互联网摘选
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