at (或in) law

according to or concerned with the laws of a country

依法，與法律有關

an agreement enforceable at law.

可依法實施的協議。

a barrister-at-law.

法律顧問。

be a law unto oneself

behave in a manner that is not conventional or predictable

（行為）反復無常，一意孤行

go to law

resort to legal action in order to settle a matter

訴諸法律

law and order

a situation characterized by respect for and obedience to the rules of a society

治安，法律與秩序

the law of the jungle

lay down the law

issue instructions to other people in an authoritative or dogmatic way

權威性命令，嚴令

take the law into one's own hands

punish someone for an offence according to one's own ideas of justice, especially in an illegal or violent way

不顧法律擅自處理

take someone to law

initiate legal proceedings against someone

繩之以法

there's no law against it

(informal)used in spoken English to assert that one is doing nothing wrong, especially in response to an actual or implied criticism

(非正式)［口語中表示沒有做錯，尤用于回應批評］法律又不禁止

I can laugh, can't I? There's no law against it.

我可以笑，不是嗎？法律又不禁止。

a law unto (oneself)

A totally independent operator

獨斷專行：完全獨立的經營者

An executive who is a law unto herself.

自行其是的女領導

take the law into (one's) own hands

To mete out justice as one sees fit without due recourse to law enforcement agencies or the courts.

隨意處罰：以某人自己覺得適合的方式給予司法處罰，而不通過正當程序訴諸法律執行機關或法庭