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。
Ten thousand pounds! Heaven forbid! How is half such a sum to be repaid?
一万镑!天不容!即使半数,又怎么还得起?
I now pay you half the sum, with the other half to be paid next week...
我现在先付你一半,剩下的一半下周付清。
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