preach
verb uk/priːtʃ/ us/priːtʃ/
(IN CHURCH)
[ I or T ]（尤指牧师在教堂中）讲道，布道
(especially of a priest or minister in a church) to give a religious speech
Father Martin preached to the assembled mourners. 马丁神父向聚集的哀悼者们布道。
During the sermon, he preached about the need for forgiveness. 在布道中，他宣讲了宽恕的必要性。
(PERSUADE)
[ T ]竭力劝说，竭力鼓吹
to try to persuade other people to believe in a particular belief or follow a particular way of life
They preach the abolition of established systems but propose nothing to replace them. 他们竭力鼓吹废除现行体制，但没有提出取代方案。
(ADVISE)
[ I ] disapproving告诫;（尤指道德）说教
to give unwanted advice, especially about moral matters, in a boring way
He's such a pain - he's always preaching about the virtues of working hard and getting up early. 他很烦人——老在宣讲努力工作和早起的美德。
My mother's always preaching at/to me about keeping my room tidy. 我母亲老是告诫我保持房间整洁。
Idiom
preach to the convertedidiom (also preach to the choir) 向已皈依者宣教布道;劝别人相信他们已经相信的东西
to try to persuade people to believe things that they already believe
You needn't bother telling us how recycling helps the environment, because you're preaching to the converted. 你不必费口舌告诉我们回收利用对环境有什么好处，因为我们早就知道了。