这山望着那山高

zhè shān wàng zhe nà shān gāo

lit. the next mountain looks taller (idiom); fig. not satisfied with one's current position

the grass is always greener on the other side of the fence

这

zhè

(pronoun) this; these

山

shān

mountain; hill (CL:座[zuo4])

望

wàng

15th day of month (lunar calendar)

着

zhe

aspect particle indicating action in progress or ongoing state

那

nà

(specifier) that; the; those (colloquial pr. [nei4])

山

shān

mountain; hill (CL:座[zuo4])

高

gāo

high