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1.malaria 疟疾 瘴气
例句:At present, no widely approved vaccine exists for malaria.
目前，还没有被广泛认可的疟疾疫苗。
2.allow to 允许
例句:They will not allow your more way-out ideas to pass unchallenged.
他们不会放过你这些古怪的念头的。
3.work on 从事
例句:The scientists are still working on new methods of fighting pollution .,
科学家们仍然在研究新的防治污染的办法。
4.from to 从什么到什么
例句:Men from 16 to 30 are to be drafted into the army.
16岁到30岁的男子均应该应征入伍。
