汉：来源于希腊语,意为“first”。在元音字母前，字母o脱落。意为“first”的词根有pri(priority),prin(principled),prim(prima donna)等。

英：word-forming element meaning "first," from Gk. proto-, comb. form of protos "first," superlative of pro "before" (see pro-).

1.protagonist
n.chief person in a drama;chief person in a story or factual event.戏剧的主角；小说的主人公 agon=struggle
Every movie is the same;there's a good guy and a protagonist he has to defeat.
每部电影都不例外；都会有一个好人以及他要战胜主人公。 2.protocol
n.first or original draft of an agreement,signed by these making it;code of behavior,etiquette as practiced on diplomatic occasions 草案，协议，行动规约，外交礼节 col=glue 3.prototype
n.first or original example form which others have been or will be copied or developed 原型，模范，样本 proto=first
General Motors unveiled a prototype of its E-car,an electric car.
通用汽车公司公布了电动车E-car 的模型。