漠漠暗苔新雨地，

The moss-clad path looks dim and damp after the shower;

微微涼露欲秋天。

the slightly cold dewdrop tells the Autumn is coming nearer. 

莫對月明思往事，

Do not think of too many things of past beneath the bright moon,

損君顏色減君年。

for that would diminish your beauty and even cut your life shorter.