恒量

wù lǐ xué zhōng pǔ lǎng kè cháng liàng h hé guāng sù c shì liǎng gè zuì jī běn zuì zhòng yào de pǔ shì héng liàng

物理学中普朗克常量h和光速c是两个最基本、最重要的普适恒量。

In physics the two most basically important and applicable constants are Plank constant h and light-speed c which brought about the development of physics.