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重点讲解：
1. out of
（表示比例）每…中；
eg. Choose four out of the total number.
从全部数目中选出四个。
eg. Out of the original 23,000 applications, 16,000 candidates meet the entry requirements.
最初的2.3万份申请中有1.6万份满足入选的要求。
2. step up
增加（数量等）；提高（速度、强度等）；
eg. He said he would pursue ongoing restructuring and step up efforts to develop "smash-hit" products.
他表示，将继续致力于正在实施的重组工作，并加大力度开发“轰动市场”的产品。
eg. If the medicine has little effect after a week step up the quantity .
一星期后如果仍不见药效，就增加剂量。
3. fall on
（庆典或特别事件）在，适逢（某日）；
eg. National Day falls on Monday this year.
今年国庆节是星期一。
eg. My birthday falls on a Monday this year.
今年我的生日适逢星期一。
4. account for
（数量或比例上）占；
eg. Studies indicate that nonfarm earnings now account for more than 20 percent of total household income.
研究资料表明，目前非农业收入占整个家庭收入的20%以上。
eg. These account for two-thirds of her total exports.
这些占它出口总额的三分之二。
5. in charge of
主管；全面负责；统领；
eg. She was in charge of bringing criminals to trial.
她负责提审罪犯。
eg. I'd like to see the person in charge of purchasing.
我想拜见负责采购的人。
