assassin 暗杀

A murderer. A person who sets out to kill someone, esp. a prominent person.
谋杀者。密谋杀害他人，特别是一位杰出人物的凶手。

例句: Police are still looking for the assassin of the president candidate.
警方仍在追查暗杀总统候选人的凶手。

assault 袭击

The act of attempting or threatening to harm another person.
试图伤害或威胁要伤害他人的行为。

例句: Mr. Green was assaulted while he was walking on 5th street.
格林先生在第5大街行走的时候受到袭击。

attack dog 攻击犬

A canine dog that has been trained to attack burglars, etc.
一种经过训练的狼犬，用来攻击窃贼等。

例句: The officer's attack dog has saved his life many times.
这位警察的攻击犬多次救了主人的命。

back-alley butcher 卑鄙的屠夫

Slang for abortionist.
俚语，给人施行流产手术的人。

例句: Demonstrators picked an abortion clinic with signs that said “back-alley” butcher.
示威者将一家流产诊所用标语牌围起来，牌子上写着“卑鄙的屠夫”。

bail 保释金

Money that is deposited with a court in order to secure the release of a defendant while awaiting trial.
存放在法庭的一定数量的保证金，以使被告在候审期间获得释放。

例句: Frank's wife came down to the police station to bail him out.
弗兰克的妻子到警察局将他保释出来。

ballistics 弹道学

The science of firearms and the study of the motion of bullets.
研究火器及子弹运动的科学。

例句: A ballistics expert was taking evidence at the scene of the crime.
一位弹道学家正在犯罪现场提取证据。