2 sentences for 留存 (liú​cún — keep)

1. 请将这份合同的复印件留存备查。

   qǐng jiāng zhè fèn hé​tong de fù​yìn​jiàn liú​cún bèi​chá.

   Please keep a copy of this contract for future reference.

   Source: Dong Chinese Dictionary

2. 银行必须按照规定留存充足的准备金。

   yín​háng bì​xū àn​zhào guī​dìng liú​cún chōng​zú de zhǔn​bèi​jīn.

   Banks must keep sufficient reserves in accordance with regulations.

   Source: Dong Chinese Dictionary