Malignant tumors are a kind of disease that seriously imperil the health as well as lives of human beings.
恶性肿瘤是一类严重威胁人类健康和生命的疾病，其基本特征就是癌细胞失控的增殖、侵袭和转移。
Cracks on water turbine impeller blades will seriously imperil the safe and economic operation of hydropower plants.
水轮机转轮的叶片出现裂纹会严重威胁水电厂的安全经济运行。
The switching-surge overvoltage of the vacuum circuit breaker can seriously imperil safety of electric system and equipment.
真空断路器的操作过电压严重威胁电力系统和设备的安全。
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