2 sentences

1. 变脸是川剧中最著名的表演技艺。

   biàn​liǎn shì Chuān​jù zhōng zuì zhù​míng de biǎo​yǎn jì​yì.

   Face-changing is the most famous performance art in Sichuan Opera.

   Source: Dong Chinese Dictionary

2. 他刚才还有说有笑的，突然就变脸了。

   tā gāng​cái hái yǒu​shuō​yǒu​xiào de, tū​rán jiù biàn​liǎn le.

   He was all smiles just a moment ago, but then he suddenly turned hostile.

   Source: Dong Chinese Dictionary