名词
1. 职业人员；专业人员
A pro is a professional.
2. （运动员、体育运动）职业的，专业的
A pro player is a professional sportsman or woman. You can also use pro to refer to sports that are played by professional sportsmen or women.
3. 赞成；支持
If you are pro a particular course of action or belief, you agree with it or support it.
4. 利弊；优缺点
The pros and cons of something are its advantages and disadvantages, which you consider carefully so that you can make a sensible decision.