Besides, it should be simple structure, light quantity and it can be convenient to remove and pack.
而且对它要求结构简单，重量轻，可以方便拆装。
The risk of developing ALS also increased as the number of pack-years smoked (product of the number of packs per day and the number of years that quantity was smoked).
罹患ALS的风险性也与吸烟的数量相关（日吸烟量和年吸烟量）。
The risk of developing ALS also increased as the number of pack-years smoked (product of the number of packs per day and the number of years that quantity was smoked).
罹患ALS的风险性也与吸烟的数量相关（日吸烟量和年吸烟量）。
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