2 sentences

1. 在某些国家，办理合同公证需要贴印花。

   zài mǒu​xiē guó​jiā, bàn​lǐ hé​tong gōng​zhèng xū​yào tiē yìn​huā.

   In some countries, revenue stamps are required for the notarization of contracts.

   Source: Dong Chinese Dictionary

2. 这份合同需要经过公证处公证才具有法律效力。

   zhè fèn hé​tong xū​yào jīng​guò gōng​zhèng​chù gōng​zhèng cái jù​yǒu fǎ​lǜ xiào​lì.

   This contract needs to be notarized by a notary office to have legal effect.

   Source: Dong Chinese Dictionary