1 sentence for 第三者 (dì​sān​zhě — number three)

1. 在列出的三项提议中，第三者最难实现。

   zài liè​chū de sān xiàng tí​yì zhōng, dì​sān​zhě zuì nán shí​xiàn.

   Among the three proposals listed, the third one is the most difficult to achieve.

   Source: Dong Chinese Dictionary