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General
containing
封口的
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all forms
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in specified order only
Chinese
English
假定一个开口朝上的气筒用一个活塞封闭起来
suppose a cylinder with open end up is closed by a piston
只需涂胶水
封口的
已印有邮票的信封
gummed only
封口处全部涂胶水的
信封
gummed all over flap
未
封口
闭
的
unsealed
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