4 sentences

1. 量子力学是研究微观粒子的重要学科。

   liàng​zǐ lì​xué shì yán​jiū wēi​guān lì​zi de zhòng​yào xué​kē.

   Quantum mechanics is an important discipline for studying microscopic particles.

   Source: Dong Chinese Dictionary

2. 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

3. 物理学家正在研究这些微观粒子在真空中的运动。

   wù​lǐ​xué​jiā zhèng​zài yán​jiū zhè​xiē wēi​guān lì​zi zài zhēn​kōng zhōng de yùn​dòng.

   Physicists are studying the movement of these microscopic particles in a vacuum.

   Source: Dong Chinese Dictionary

4. 我们需要从微观角度来分析这个问题。

   wǒ​men xū​yào cóng wēi​guān jiǎo​dù lái fēn​xī zhè​ge wèn​tí.

   We need to analyze this problem from a microscopic perspective.

   Source: Dong Chinese Dictionary