1 sentence for 机 (jī — opportunity)

1. 错过此机，以后很难再有这样的运气。

   cuò​guò cǐ jī, yǐ​hòu hěn nán zài yǒu zhè​yàng de yùn​qi.

   If you miss this opportunity, it will be hard to have such luck again.

   Source: Dong Chinese Dictionary