许多网络词最初并不规范,但经过长期使用便约定俗成了。Xǔduō wǎngluò cí zuìchū bìng bù guīfàn, dàn jīngguò chángqī shǐyòng biàn yuēdìng súchéng le.Many internet terms are not standard at first, but through long use they become established by convention.
过年贴春联的风俗早已约定俗成。Guònián tiē chūnlián de fēngsú zǎo yǐ yuēdìngsúchéng.The custom of pasting New Year couplets became established long ago by common practice.
握手时先伸右手,这是约定俗成的礼节。Wòshǒu shí xiān shēn yòushǒu, zhè shì yuēdìngsúchéng de lǐjié.When shaking hands, you first offer the right hand; this etiquette is established by convention.