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新词句

Pack-year

Pack-year 指烟民一年间每天抽一包烟,用来衡量抽烟的时间和数量

例句:

My friend's father has been smoking for 16 pack-years. It's no wonder he developed lung cancer at his age.

我朋友的父亲已经有16年烟龄,每天一包未曾间断。(剩余1279字)

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