1.malaria 瘧疾 瘴氣
例句:At present, no widely approved vaccine exists for malaria.
目前,還沒有被廣泛認可的瘧疾疫苗 。
2.allow to 允許
例句:They will not allow your more way-out ideas to pass unchallenged.
他們不會放過你這些古怪的念頭的 。
3.work on 從事
例句:The scientists are still working on new methods of fighting pollution .,
科學家們仍然在研究新的防治污染的辦法 。
4.from to 從什么到什么
例句:Men from 16 to 30 are to be drafted into the army.
16歲到30歲的男子均應該應征入伍 。