niece n. 侄女,外甥女
widow n. 寡妇
couple n.①夫妇②对,双③两三个,一些: a couple of days两三天vt.①连接:An engine is coupled to a railway train.②结合,结为夫妻
double ad. ①两倍的:do double job做双份工作②双的:a railway with a double track双轨铁路③供两者用的:a double bed双人床;v.使加倍,把增加倍:The output has been doubled in the past five years,过去五年中产量翻了一番。
pair vt. 成对,配对:Birds often pair for life. 鸟通常是成对地生活终老。n. ①对:a pair of shoes 一对夫妇,一对情侣
pair和couple:象shoes样由两件组成一套的物品称为a pair,象trousers或spectacles等含有两部分的物品也称为a pair
a couple则指同种物品有两个,如:a couple of cars/cats
neighbor n. 邻居,邻国
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