threshold of deadly current
... Input Threshold Current 输入阈值电流 lasing threshold current 激光抽运阈值电流 threshold of deadly current 致命阈值 ...
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很显然这是因为，20世纪40年代以前，吸烟年限足以引发致命癌症的男性烟民并不多(女性烟民到70年代才达到这一阈值，即吸烟年限过长引发癌症)。
That was simply because, until the 1940s, not enough men had been smoking for long enough to develop fatal cancers (women did not reach this threshold until the 1970s).
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