免于的英文：
be exempted from
free of
freedom from

参考例句：

Immunize a witness
使目击证人免于起诉

His card joined the small pile of those spared from the layoff.
他的登记卡被放到那一小叠免于被裁的人的卡片里面。。

Of or relating to persons exempt from the legal jurisdiction of the country in which they reside.
治外法权的免于居住地所在国合法审判的人的，与其有关的

Bribes paid to officials by racketeers for immunity from prosecution.
保护费诈骗勒索者为免于被起诉而向官员提供的贿赂

Defend .. against; guard .. against
防卫..以免于

salvable merchandise that survived the fire.
免于水灾的可救货物

A near hit by the incendiary bomb.
幸免于燃烧弹的袭击。

Dividers that keep the files from jumBling.
使档案免于混淆的分类卡

Exempt from working overtime
免于超时工作

Oil preserves metal from rust.
油保护金属免于生锈。

exempted是什么意思：
v. 免除；豁免
adj. 被免除的；被豁免的
n. 免税者；被免除义务者

The student was exempted from that required course.
该学生被允免修那门必修课。

A concerned party is exempt from responsibility.
则有关的一方免除其责任。

An official document or warrant declaring such an exemption.
赦免状宣布此类赦免的官方文件

free是什么意思：
adj. 自由的；免费的；空闲的；任意的；免税的；游离的
adv. 免费地；自由地
v. 释放；免除；使自由，解放

Freedom is not free.
自由不是无偿的。

Be covered by free Medicare / be entitled to free medical care
享受公费医疗

It depends on free oxygen or air.
它依靠大量的氧或者空气。

freedom是什么意思：
n. 自由，自主；自由权

Freedom is not free.
自由不是无偿的。

They aspire to freedom.
他们渴望得到自由。

Academic freedom has to be freedom of spirit and it is not political with passive negativity.
学术自由权应是精神自由权,具有非政治性和消极否定性。