against是什么意思？

　　例句：

　　1、The general feeling of the meeting was against the decision.

　　會(huì)議上普遍的意見是反對(duì)這個(gè)決定。

　　2、New information is matched against existing data in the computer.

　　新的資料和電腦中已有的`數(shù)據(jù)作了比較。

　　3、I don't want to go against your will.

　　我不想違背您的意愿。

　　4、Teachers are up against some major problems these days.

　　老師們最近面臨著一些重大問題。