在取得綠卡之後，到中國工作，但服務於美國在中國的機構或公司。在這種情況下，是否有規定說，可以免除在美國必須連續居留以保持綠卡身份的要求呢？意思是在美國以外可以停留比較長時間不回美國（如超過一年），仍然保持綠卡有效？
-You need to apply for the reentry permit (RP) for teh travel if you want to stay in China for > one year < two years. If you wanto use the time you spend in China as the physical presence required for US citizenship application, you may need to file N-470, Application to Preserve Residence for Naturalization Purposes. But you still need to get RP even if you apply for N-470. See the N-470 instructions at
http://www.uscis.gov/files/form/n-470instr.pdf
-You need to apply for the reentry permit (RP) for teh travel if you want to stay in China for > one year < two years. If you wanto use the time you spend in China as the physical presence required for US citizenship application, you may need to file N-470, Application to Preserve Residence for Naturalization Purposes. But you still need to get RP even if you apply for N-470. See the N-470 instructions at
http://www.uscis.gov/files/form/n-470instr.pdf
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