【说文解字】表示“最初，首要，第一”的前缀有prim-，prin-，prem-，prot-=first， 其中prim=prin，由m异化为n而产生，prim=prem，由 i异化为e而产生，基本的意思是“最初，首要，第一”，分别表达的是时间，地位和空间概念。
由于排在第一位的往往都是主要的或重要的事物，prim-，prin-，prem-引申出“重要的、主要的”含义，由此可知，这三个前缀并非纯表示数量“一”的词缀。由此我们联想到表示频率的词根every“每一”。
【经典例句】
(1) Small seashells were often used as a primitive kind of money.小贝壳常被用作简单的货币.
(2) The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业.
(3) The primary reason for advertising is to sell more goods. 做广告的根本目的是要多出售货物.
(4) The initial selection of member sizes is called "preliminary design".构件尺寸的初步选择叫做"初步设计".
(5) There are a lot of preliminaries to be gone through before you can visit a foreign country. 在出访外国之前要做好许多准备工作.
(6) This building was primarily intended to be a dinning hall.这座建筑原来是打算用作餐厅的.
(7) Her prime concern is to protect the property. 她最为关心的是保护财产.
(8) When is a man in his prime? 一个人的盛年在什么时候?
(9) I shall have to refuse your invitation because of a prior engagement. 我因有约在先, 所以只好谢绝你的邀请.
(10) Vehicles coming from the right have priority. 从右边驶来的车辆享有优先通行权.
(11) The prince lived in a large and beautiful castle. 王子住在一个美丽的大城堡里.
(12) Prince Charles was invested as Prince of Wales in 查尔斯王子于年受封为威尔士亲王.
(13) Now this Princess, who was wonderfully pretty, was just sixteen years old.公主刚满十六岁，生得姣艳绝伦.
(14) These machines both work on the same principle. 这两台机器的工作原理是相同的.
(15) He is going to fill the position of principal.他将去担任中学校长的职务.
(16) My principal concern is my family's welfare. 我至为关心的是我一家的幸福.
(17) Premier Zhou is a distinguished politician. 周总理是一位卓越的政治家.
(18) Try to balance your diet by eating more fruit and less protein. 多吃些水果, 少摄入些蛋白质, 使饮食均衡合理.
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