如何区分以下常用词 zyt032005-04-18 05:41:57

1。工卡 （what is the english name for it?)
2。劳工卡（what is the english name for it?)
3。劳工纸（what is the english name for it?)
4。Labor Certificate。
5。Work Permit。
6。Employment Authorization Card.

Thanks.

回复：如何区分以下常用词

工卡和劳工卡好像不是一回事，