In the Middle Ages the term "drab" denoted a very simple type of woollen cloth which was used by peasants to make their clothes.中世紀時，drab（“本色布”）一詞指的是一種農(nóng)民用來制衣的非常普通的羊毛織物。The union of two sets A and B is denoted by AUB.兩個集合...
The clauses have different relations which are often denoted by correlatives.各分句之間可以有各種不同的關系,常用關聯(lián)詞表示.The union of two sets A and B is denoted by AUB.兩個集合A和B的并,用AUB表示.In the Middle Ages the term "drab" denoted a very simp...