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
You start schooling by rolling into pre-school with your chocolate milk and snack pack. The next year, you bring your kiddie backpack to kindergarten.
你带着巧克力奶和零食包很圆润的滚到了小班，第二年，带着你的玩具袋进到了幼儿园。
Last year his designers found a way to pack the popular three-seater more compactly, doubling the amount of sofa they could cram into a given space.
去年他的设计师们将这款流行的三座式压缩的更加紧凑些，成倍增加了往既定空间塞入该沙发的数量。
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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