■valuable: a small object, especially jewellery, which might be sold for a lot of money(貴重物品). eg.

recover stolen valuables

語(yǔ)法：總是用復(fù)數(shù)形式。

■variable: a number, amount or situation which can change(可變的事物; 可變的量). eg.

The variables in the equation are X, Y and Z.

The data was analysed according to neighbourhoods, but other key variables like credit rating, job history, savings and marital status were ignored altogether.

語(yǔ)法：可數(shù)，常用復(fù)數(shù)。

■untouchable: in some societies, someone who belongs to the lowest social class(賤民，不可接觸者). eg.

He was born an untouchable in a very poor village in south India.

語(yǔ)法：可數(shù)。

■unmentionable：unmentionable people or things (esp underwear)（不宜提到的人或事物， （尤指）內(nèi)衣）.

語(yǔ)法：總是用復(fù)數(shù)形式。

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