“惯常的”用英语怎么说？

不透露患者病情的细节是惯常的做法。It is normal practice not to reveal details of a patient's condition.他们讥讽着，喊叫着，打破了惯常的那一分钟沉默。They interrupted the customary one minute's silence with jeers and shouts.这封信是用她惯常的尖刻语调写的。The letter ...