如下是法定说法：
A non-resident alien is classified as a resident alien for tax purposes if they were physically present in the U.S. for 31 days during the current year and 183 days during a three-year period that includes the current year and the two years immediately before that.
即，你每年报税的时候，当初你最开始不够1整年的赴美时间也凑1年算。
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