这山望着那山高

这山望着那山高:

Literally means:

it is always the mountain yonder that looks higher; the grass is always greener on the other side of the fence

Actually means:

Seen from this mountain, the other mountain al ways seems higher.

This phrase figuratively mean constantly being dissatisfied with one's present situation or career and looking forward to better situations or jobs elsewhere. Often used as remonstration on being content with the present or cherishing one's present life or work. Slightly derogatory.

在一座山上看别的山，总觉得比自己在的山要高。

比喻对自己现在的处境、工作不满意，总觉得别的环境或别的工作好。常用于告诫不要对现状不满或劝告别人要珍惜现有的生活或工作。略含贬义。