5 sentences

1. 万有引力是宇宙的基本法则。

   wàn​yǒu​yǐn​lì shì yǔ​zhòu de jī​běn fǎ​zé.

   Universal gravitation is a fundamental law of the universe.

   Source: Dong Chinese Dictionary

2. 物竞天择是自然界演化的基本法则。

   wù jìng tiān​zé shì zì​rán​jiè yǎn​huà de jī​běn fǎ​zé.

   Natural selection is the fundamental law of biological evolution.

   Source: Dong Chinese Dictionary

3. 打仗最重要的法则是兵在精而不在多。

   dǎ​zhàng zuì zhòng​yào de fǎ​zé shì bīng zài jīng ér bù zài duō.

   The most important rule in warfare is that the quality of troops matters more than their quantity.

   Source: Dong Chinese Dictionary

4. 数学中有许多重要的运算法则。

   shù​xué zhōng yǒu xǔ​duō zhòng​yào de yùn​suàn fǎ​zé.

   There are many important operational rules in mathematics.

   Source: Dong Chinese Dictionary

5. 在这个多变的时代，很少有永恒不易的法则。

   zài zhè​ge duō​biàn de shí​dài, hěn shǎo yǒu yǒng​héng bù​yì de fǎ​zé.

   In this ever-changing era, few rules remain forever unchanged.

   Source: Dong Chinese Dictionary