名詞 malpractice:

1. professional wrongdoing that results in injury or damage
2. a wrongful act that the actor had no right to do; improper professional conduct

1. Various malpractices by police officers were brought to light by the enquiry.
   警察的各種不法行為經(jīng)調查已揭露出來。

mal.prac.tice

n.（名詞）
Improper or negligent treatment of a patient, as by a physician, resulting in injury, damage, or loss.
治療失當：例如由于內科醫(yī)生對病人不當?shù)幕虿萋实闹委煻鴮е碌氖軅?、損傷或損失
Improper or unethical conduct by the holder of a professional or official position.
瀆職：專業(yè)人員或官員不良的或不道德的行為
The act or an instance of improper practice.
不端行為：不良行為的行動或例子

【引伸】
mal.practi.tioner