这一段英文你应该看得懂吧：

If you are a green card holder, you may be wondering how your immigration and taxes will work. As mentioned above, as soon as you acquire a green card, you are automatically classified as a United States tax resident and must report all of your income, whether earned abroad or domestically.

- See more at: http://immigration.findlaw.com/visas/immigration-and-taxes-who-has-to-pay-u-s-taxes.html#sthash.Fw27dGWb.dpuf