[zhuān xīn zhì zhì]
devote oneself heart and soul to ...; be thoroughly engrossed in ...; be wedded to ...; do sth. with a will; be wholly given up to ...; concentrate one's energy on ...; devote oneself to sth. wholeheartedly and exclusively; devote one's whole mind to ...; keep one's mind on (one's work, etc.); put one's back [heart, whole heart and soul, life] into ...; throw oneself heart and soul into (one's work); wholly absorbed; with single-hearted devotion; with singleness of purpose