美国911事件之后,对移民、出入境的检查尤其严格,而这也引发了一个危机,微软总裁盖茨表示担忧Bill Gates expressed concern about the U.S. immigration system, saying limits on the number of visas for high-skilled workers, bureaucratic delays in processing them and exhaustive security checks following the September 11, 2001 terrorist attacks are [w=deter]dete…