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1.on average 平均；普通
例句:American shares rose, on average, by 38%.
美国股票价格平均上涨了38%。
2.local elections 地方选举
例句:Ruling parties have lost ground in national and local elections.
执政党在全国和地区选举中均败北。
3.on offer 出售中
例句:Some shoppers looked bewildered by the sheer variety of goods on offer.
光是摆在那里的各式商品就让一些购物者晕头转向了。
4.think-tank 智囊团
例句:During her studies, she spent a summer in India based at a think-tank in New Delhi.
学习期间，她在印度新德里的一家智库度过了一个暑假。
