1 sentence for 认定 (rèn​dìng — set one's mind)

1. 既然认定了这个目标，就要努力实现。

   jì​rán rèn​dìng le zhè​gè mù​biāo, jiù yào nǔ​lì shí​xiàn.

   Now that you've set this goal, you should work hard to achieve it.

   Source: Dong Chinese Dictionary