对群体紧急疏散进行研究，具有极大的现实意义和社会安全价值。
The study for crowd emergency evacuation is of great practical significance and helpful for social security.
教育和社会安全将不得不适应一个工作机会持续被高速地创造和替换的世界。
Education and social security will have to adapt to a world in which jobs continue to be created and displaced at a rapid rate.
如果你去的时候刚好是秋季的学期之前，你还可以在那里拿到你的学生证和社会安全码。
If you go there just before the beginning of the fall's semester, you can get your student ID and social security number there. They will keep your documents up-to-date.
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