1 sentence

1. 量子力学主要研究微观世界的物理现象。

   liàng​zǐ lì​xué zhǔ​yào yán​jiū wēi​guān shì​jiè de wù​lǐ xiàn​xiàng.

   Quantum mechanics mainly studies physical phenomena in the microscopic world.

   Source: Dong Chinese Dictionary