1 sentence for 定时 (dìng​shí — to fix a time)

1. 定时20分钟，做一些深呼吸练习来放松。

   dìng​shí20 fēn​zhōng, zuò yī​xiē shēn​hū​xī liàn​xí lái fàng​sōng.

   Set a timer for 20 minutes and do some deep breathing exercises to relax.

   Source: CCMatrix