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