The researchers say their study shows a vaginal gel substance reduced the risk of HIV infection among women who used it.
VOA: special.2010.07.21
so it's specifically for people in their first year of study.
主要就是为新生开设的。
At most American colleges, undergraduate students choose one area of study, like English or biology, and focus on it for all four years of their education.
VOA: standard.2010.05.12
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