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VERB
讲道；布道；传教
When a member of the clergy preaches a sermon, he or she gives a talk on a religious or moral subject during a religious service.
例句
At High Mass the priest preached a sermon on the devil...
牧师在大弥撒上布道驱邪。
The bishop preached to a crowd of several hundred local people...
主教向当地聚集的数百人布道。
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VERB
宣传；鼓吹
When people preach a belief or a course of action, they try to persuade other people to accept the belief or to take the course of action.
例句
The Prime Minister said he was trying to preach peace and tolerance to his people...
首相表示他在竭力向他的人民宣传和平和宽容。
Health experts are now preaching that even a little exercise is far better than none at all...
现在健康专家都在宣扬，即使是少量的运动也远比根本不运动好得多。
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VERB
说教；唠叨；不胜其烦地劝诫
If someone gives you advice in a very serious, boring way, you can say that they are preaching at you.
例句
'Don't preach at me,' he shouted.
他大喊道：“不要对我说教。”
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PHRASE
以身作则；身体力行；躬行己说
If you say that someone practises what they preach, you mean that they behave in the way that they encourage other people to behave in.
例句
He ought to practise what he preaches.
他应该以身作则。
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PHRASE
向教徒传道（表示向已经接受某种思想的人宣传这种思想）
If you say that someone is preaching to the converted, you mean that they are wasting their time because they are trying to persuade people to think or believe in things that they already think or believe in.