through thick and thin 不顾艰难险阻；历尽千辛万苦；不畏艰险

【例句】
Mole and Badger, they stuck out, through thick and thin, that you would come back again soon, somehow.
鼹鼠莫尔和獾子班杰不畏艰险，坚持说，不管怎样，你很快就会回来的。

I will go on loving James through thick and thin no matter what happens.
不管发生什么，不管经历多少艰辛，我都会一直爱着詹姆斯。