全面從嚴(yán)治黨

to practice/exercise strict self-governance in every respect

to exercise full and strict governance over the Party

to strengthen Party self-governance

to strengthen Party self-discipline

例句：辦好中國(guó)的事情，關(guān)鍵在黨，關(guān)鍵在堅(jiān)持黨要管黨、全面從嚴(yán)治黨。

——摘自習(xí)近平在慶祝改革開放四十周年大會(huì)上的講話，2018年12月18日

譯文：China's success hinges on our Party, so we must ensure that the Party exercises effective self-supervision and practices strict self-governance in every respect. 

– from the speech at the conference celebrating the 40th anniversary of reform and opening up, December 18, 2018