con前缀的含义是

造句：

1.、Were you present at the declamation con test of Freshmen?

大一的朗诵比赛你参加了没有？

2.Danny used to be a short - con artist who excelled at card tricks and pick-pocketing.

丹尼曾是小拐小骗方面的艺术家，精于牌戏和摸包。

3.I’ve seen recent arguments, pro and con, about making Linux an industry standard OS, that is, adding as many users as possible.

我看了最近关于赞成和不赞成让Linux成为工业标准的操作系统进而增加用户的争论。