AIDS is a global issue concerning important public health and social hot problems, and one of the important issues of population security as well.
艾滋病是全球关注的重要公共卫生和社会热点问题，同时它也是关乎人口安全的重大问题之一。
The SAT, like the ACT, continues to have security problems. Last week, hundreds of questions for future SAT exams were made public without the College Board's permission.
SAT考试也和ACT考试一样存在安全问题。上周，数百道未来SAT考试的考题未经大学理事会授权被公开。
The security of a braid public key cryptosystem can't depend only on the hardness of conjugacy problems.
辫子群上公钥密码系统的安全性不能仅仅依靠共轭问题的难解性。
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