1.document作名词=a piece of paper that has official information on it（文献，文件）

1.1email的附件是enclosed document＝file attached

1.2出门旅游要随身带好travel document(旅游证件) 

1.3出示证件一般用produce documents 

2.document作动词=to support an opinion, argument etc with recorded facts （用文献支持/证明），如果sth is well documented =sth is recorded in great detail，例如：It is well documented that men die younger than women（有充分文献证实了男人比女人死得早）

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