天上不会掉馅饼

tiān shàng bù huì diào xiàn bǐng

there is no such thing as a free lunch (idiom)

tiān

day

shàng

(bound form) up; upper; above; previous

no; not so

huì

can; to have the skill; to know how to

diào

to fall

xiàn

filling; stuffing (for dumplings, pies etc)

bǐng

round flat cake