... BET 平衡发射极晶体管 BET 弹道的最佳估算 SEVIS 〈美国〉留学生及交流访问学者信息系统 ...
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But SEVIS was being developed even before the attacks as a way to improve record keeping on foreign students in the United States.
但在袭击事件发生前，SEVIS就作为一种改进在美留学生记录的保管方式存在了。
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