'Thanks, Ernie,' I said, and slipped him half a pack of Camels.
“多谢!”我说,偷偷递给他半包骆驼牌香烟。
Twin B smoked half a pack a day for 14 years, while her sister never
双胞胎之一B,每天吸半包烟达14年之久。 她的姐姐A从未吸烟。
Former smokers, or those who smoked less than half a pack per day, did not appear to be at increased risk.
曾吸烟的人或者每天吸烟低于半包的人看起来不处于增加的风险中。
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