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A homily is a speech or piece of writing in which someone complains about the state of something or tells people how they ought to behave. 说教; 训诫
[正式]
例：
...a receptive audience for his homily on moral values.
In his homily the archbishop said the management of the unique heritage of this beautiful and fascinating territory, rich in colors, vegetation and art, is lacking.
VOA: standard.2009.10.10
They make us listen to a homily in the gratified interval between two courses.