英语中有很多介词，介词属于虚词，因此比较难掌握。我们今天来看看against 的用法吧！
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against /e'genst,e'geinst/prep.
①表示“逆，顶着；靠着，倚靠；碰着，撞击（方向或位置）”， 如，
I have hit my head against a wall and hurt myself.
我的头撞到墙上并受了伤。
He stood with his back against the wall.
他背靠墙站着。
②表示“反对···(与for意义相反）； 违背”， 如：
I don't know whether he is for or against it.
我不知道他是赞成还是反对。
They fought bravely against the enemy.
他们英勇地同敌人战斗。
He did it against his own will.
他是违心地做那件事的。、
It is against the principles.
这是违背原则的。
③ 表示＂防备，准备＂， 如：
Some animals store food against the winter.
有些动物为过冬贮备食物。
They have got prepared against flood.
他们已经做好了防洪准备。
④表示“衬托，相映”， 如：
Flowers look better against green leaves.
好花还需绿叶扶。
短语总结：
for and against 赞成和反对
stand against反抗；抵抗；反对；站起来反对
hedge against套期保值；套期守值；套期保値；两边下注
Against logy加一杆赛
guard against防止；提防；防备；预防
play against对赛；对于赛；与……比赛；对抗
discriminate against歧视；排斥
act against违反；违背；消灭
vote against投票反对；投票反对某人
knock against偶然遇见；撞击；碰撞；与…冲突
up against 面临
go against 不利于；违反；反对
over against 在…对面；正对着；与…相反；与…形成对照
as against 与…相对照；比…
back against 背朝着
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