ZIzǐ子YTyuē曰:XTxué学ORér而UIshí时XIxí习VIzhī之,BUbú不YIyì亦UOshuō说HUhū乎?YByǒu有PGpéng朋ZIzì自YRyuǎn远FHfāng方LLlái来,BUbú不YIyì亦LElè乐HUhū乎?RFrén人BUbù不VIzhī知ORér而BUbú不YPyùn愠,BUbú不YIyì亦JPjūn君ZIzǐ子HUhū乎?