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Without any sign, his legs suddenly failed, causing him to tumble down heavily.
他的双腿毫无征兆地瘫软，使他重重跌倒在地。
金山词霸
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A virus can be a cyber threat that continues to function even during a complete system failure.
计算机病毒可能是一种网络威胁，即使在系统完全瘫痪时也能继续运作。
金山词霸
