1.infection 感染
Ear infections are common in pre-school children.
耳部感染在学前儿童中很常见。
2.multiply 增加
Such disputes multiplied in the eighteenth and nineteenth centuries.
这类纠纷在18和19世纪大量增多。
3.fall back 回落
After a brief rally share fall back to a new low.
股票经过一次短暂回升后回落到一个新的低点。
4.perform 执行；完成
This operation has never been performed in this country.
这个国家从未做过这种手术。

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