反对的英文：
fight against
oppose
be opposed to
opposition

参考例句：

Laws against child abuse should be stiffened up.
反对虐童的法律应该严格执行。

A stalwart proponent of tax reform
对税务改革的顽固反对

condemned the needless waste of food.
反对不必要的粮食浪费

Pluck by the beard
"毅然反对,大胆攻击"

I demur to working on Sundays
我反对星期天工作。

Knock off every objection.
排除一切反对意见。

Oppose the revival of militarism.
反对军国主义复活。

crass protested against the introduction of politics in that meeting.
克拉斯反对在会上谈论政治。

Get/have one's own way( often in spite of opposition)
为所欲为(常指不顾反对意见)

A professed opponent of free trade
公开声称反对自由贸易的人

fight是什么意思：
n. 斗志，战斗力，比赛
v. 与…作斗争，坚决反对，（为…而）斗争，努力争取，参加，努力克制

This is a clean fight.
这是一场公平的较量。

If they start fighting, we fight back, fight to win peace.
人家打来了，我们就打，打是为了争取和平。

The fight resulted in a stalemate.
战斗形成对峙局面。

against是什么意思：
prep. 与...相反；对...不利；倚靠；以防；以...为背景；和...相比

It is against federal law to discriminate against blacks.
歧视黑人是违反联邦法律的。

She was drugged against the pain.
她服麻醉药止痛。

He informed against the drugpusher.
他告发了那个毒品贩。

oppose是什么意思：
v. 反对；反抗；妨碍；使相对；使对抗

You should oppose reason to prejudice.
你应以理智对抗偏见。

He is strongly opposed to the plan.
他强烈反对这一计划。

The left oppose the tax increase.
左翼人士反对增税。