half-sum method 升降中点法
Only two in ten of the wallets were returned to their owners and only around half of those (55%) contained the original sum of money.
十只钱包里只有2只被送回主人,并且这些归还的钱包中只有大概一半是分文未动的。
This is a great tragedy, because now you get one-half the sum of the masses, which is three times this small number squared.
这是个大悲剧,质量变为原来的一半,是此数字平方的三倍。
Some worthy citizen had set aside a large sum half a century previously in order to accrue interest and build up enough funds to build the bridge.
某位有威望的市民早在半个世纪之前就已经留置了一大笔钱,为的是增长利息,积累足够的资金建造这座桥。
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