2 sentences

1. 请把这些文件进行双面复印。

   qǐng bǎ zhè​xiē wén​jiàn jìn​xíng shuāng​miàn fù​yìn.

   Please make double-sided copies of these documents.

   Source: Dong Chinese Dictionary

2. 他在不同的人面前表现出双面人格。

   tā zài bù​tóng de rén miàn​qián biǎo​xiàn chū shuāng​miàn rén​gé.

   He displays a two-faced personality in front of different people.

   Source: Dong Chinese Dictionary