多达百分之四十的学生逾签证期限滞留。
Up to forty percent of the students had overstayed their visas.
你能告诉我获得学生签证需要做些什么，需要多长时间吗？
Could you tell me what I have to do to obtain a student visa and how long the process will take?
签证程序的变化导致申请美国大学的外国学生数量急剧下降。
Changes in the visa process caused a dramatic decline in the number of foreign students seeking admission to the U.S. universities.
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