... 原因不明的故障 bugs ; passive defects 原因不明的动作 doubtful operation 原因不明的飞行事故 unexplained accident ...
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It was doubtful whether the patient would survive the operation.
很难说这病人能否在手术中活下来。
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It is doubtful whether the old man will recover from the operation.
那老人手术后是否会康复难以确定。
It's doubtful if her heart would stand the strain of another major operation.
很难说她的心脏是否能再次承受大手术。
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