1866, shortening of professional (n.). The adjective is first recorded 1915 (in golfing's pro shop).
pro (n.2)
"a consideration or argument in favor," c. 1400, from Latin pro (see pro-). Pro and con is attested from c. 1400, short for pro and contra "for and against" (Latin pro et contra).
权威例句
1. It is only an Elastoplast solution to a far greater constitutional pro-blem.
对于一个非常严重的宪法问题来说,这只是个暂时的解决方案。
2. He was at the forefront of the pro-democracy campaign in the country.
他活动在该国亲民主运动的前沿。
3. The pro-gramme's researchers are guilty of bias and misrepresentation.
该项目的研究者们对心存偏见和误解感到非常内疚。
4. I'm one of the few that's very pro performance-related pay.
我是少数极力赞成绩效工资的人之一。
5. Rebellions in the area were bloodily repressed by pro-government forces.