According to a survey by giant Alibaba in 2018, the market for the second hand book was booming last year as more Chinese tend to trade or exchange their used books online.

根据巨头阿里巴巴2018年的一项调查，二手书市场在去年蓬勃发展，因为越来越多的中国人倾向于在网上交易或交换他们的二手书。

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So when one monkey was handed a grape in exchange for her token, the second was reluctant to hand hers over for a mere piece of cucumber.

因此，当一只猴子用一颗葡萄来换回她的一个筹码时，另一只猴子不愿意用一颗葡萄换回一片黄瓜。

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On the other hand, there appeared an ever-growing social group of private entrepreneurs who had a constant need to exchange their contact information.

另一方面，私人企业家的数量也在日益增长。这些人需要经常交换他们的联系信息。

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In 1963, at the age of forty-six, he made up for it by setting up his own informal school in a London railway station, teaching half a dozen teenagers in exchange for a little tobacco or a second-hand art book.

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Electronics brands will often donate 15 or 30 copies of a product in exchange for the opportunity to place it directly in a celebrity's hand, says Nathalie Dubois-Sissoko, owner of DPA, a Los Angeles-based celebrity gifting company.

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It is rather like one of the buffet dinners so favoured by global gatherings, where you have to balance a wine glass and a plate in one hand, feed yourself with the other, try and have a sensible conversation and exchange cards with three people at the same time.

ECONOMIST: Economic globalisation