cǎo mù / de / róng kū / shì / zì rán / guī lǜ / wǒ men / bù bì / guò yú / gǎn tàn

草木的荣枯是自然规律，我们不必过于感叹。

The flourishing and withering of plants is a natural law, so we need not sigh too much.