并行不悖

bìng xíng bù bèi

to run in parallel without hindrance

not mutually exclusive; two processes can be implemented without conflict

并

bìng

variant of 並|并[bing4]

行

xíng

(bound form) to walk; to go; to travel

不

bù

no; not so

悖

bèi

old variant of 悖[bei4]