不易

zhè xiē jiāo tōng gōng jù bù yì gǎi zuò xīn de yòng tú

这些交通工具不易改作新的用途。

The vehicles are not easily adaptable to new uses.

lái zhī bù yì de shèng lì

来之不易的胜利

hard-earned victory

bù yì zhī lùn

不易之论

unalterable speech