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。

youdao

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。

youdao