这是国内派你去的学校对你的要求吧,要求你回国后必须在学校服务2年。
J1签证就是让从美国回来以后必须在国内带上两年才能再次去美国。
美国国务院的规定
What is the 2 year rule or 212(e)?
Under specific circumstances, J-1 and J-2 status holders may incur a two-year home physical presence requirement. If one is subject to the rule, this means that he/she is not eligible to change to H, L or Permanent Residency (PR) classification without first returning to the home country for a total of 2 years. A waiver of this requirement can be applied for and obtained in specific circumstances. If the two year rule applies, changing status from J to another non-immigrant classification (such as F-1) in the United States is prohibited. Two year rule does NOT prohibit one from returning to the U.S. in any classification besides H, L, or PR.
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