患者曾有吸烟史，吸烟指数 (pack-year) 为 20（吸烟指数即平均每天吸烟的盒数×吸烟年限，如每天吸烟 1 包，吸了 20 年，即吸烟指数为 20），不酗酒。
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N a measure of the amount of cigarettes a person has smoked over an extended period, equal to one packet of 20 every day for one year 某人在一段时间内抽烟的数量记录; 等同于一年内每天抽一包20支烟
Five Second Lost Item Locating System: $19.95 for the starter pack; Membership: Included the first year, $4.70 each year after
五秒失物定位系统：初始使用包19.95美元；会员费：首年免费，以后每年4.70美元。
If you smoke a pack a day, you spend about $ 63 per week, $ 252 per month, $ 3 285 per year and $ 16 500 within five years.
如果一天一包烟，你大概要花63美元一个星期，252美元一个月，3285美元一年，那么5年就要花16500美元。
Before his third grade school year started, a Cub Scout Pack leader called and asked if I would take on another boy.
当儿子上三年级的时候，另一名幼年童子军的领队人给我打了个电话，问我是否能让一名男孩加入我的队伍。
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