https://www.uscis.gov/policy-manual/volume-12-part-d-chapter-2
USCIS reviews multiple factors when assessing whether an applicant objectively intended to abandon his or her LPR status,[34] including:
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Length of absence from the United States;
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Purpose of travel outside the United States; (看工作性质，如果美国公司派到中国，好一些。)
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Intent to return to the United States as an LPR; (每年回来看孩子，has intent )
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Continued ties to the United States.(在美有房子有孩子, continued ties)
