【在 S*L 的大作中提到】 : no need for W7 again : 170 + 183/6 = 210.5 so yes, you may.
S*L
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http://www.irs.gov/businesses/small/international/article/0,,id=96352,00.html You will be considered a U.S. resident for tax purposes if you meet the substantial presence test for the calendar year. To meet this test, you must be physically present in the United States on at least: 31 days during the current year, and 183 days during the 3-year period that includes the current year and the 2 years immediately before that, counting: All the days you were present in the current year, and 1/3 of th