Medical ethics (ie those observed by the medical profession) forbid a doctor to have a love affair with a patient.
行医道德有规定, 禁止医生与病人谈恋爱.
ethics is a branch of philosophy.
伦理学是哲学的分科.
Lee carries over his business ethics into his personal relationships.
李把他在生意中的道德标准运用到私人关系中去。