包括德州仪器在内的一些公司表示，他们公司的外籍员工要成为永久居民需要耗时十年之久。
Some companies, including Texas Instruments, say it can take ten years for their foreign workers to become permanent residents.
虽然外籍人以永久居民状态被要求运载这些身份证，美国公民不被要求运载任何公民身份证明。
Though aliens with permanent resident status are required to carry these identification CARDS, American citizens are not required to carry any citizenship identification.
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