2 sentences for 下流 (xià​liú — vulgar)

1. 这种下流的玩笑一点也不好笑。

   zhè zhǒng xià​liú de wán​xiào yī​diǎn yě bù hǎo​xiào.

   This kind of dirty joke isn't funny at all.

   Source: Dong Chinese Dictionary

2. “下作”里的“作”读去声，表示下流、卑鄙的意思。

   “ xià​zuo” lǐ de“ zuò” dú qù shēng, biǎo​shì xià​liú, bēi​bǐ de yì​si.

   The character 'zuo' in 'xiazuo' is pronounced in the falling tone, meaning low, mean, or contemptible.

   Source: Dong Chinese Dictionary