2 sentences for 上下 (shàng​xià — high and low)

1. 全国上下正众志成城地抗击疫情。

   quán guó shàng​xià zhèng zhòng​zhì​chéng​chéng de kàng​jī yì​qíng.

   The whole country is united in fighting the pandemic.

   Source: Dong Chinese Dictionary

2. 全厂上下都在为完成任务而努力。

   quán chǎng shàng​xià dōu zài wèi wán​chéng rèn​wu ér nǔ​lì.

   Everyone in the factory, from top to bottom, is working hard to complete the task.

   Source: Dong Chinese Dictionary