全心全意
wholeheartedly; with all one's heart; heart and soul
e.g. 全心全意为人民服务首先要有无私奉献的精神。
Wholehearted service to the people presupposes a spirit of selfless dedication.
e.g. 半个世纪以来，他全心全意地研究中国医学。
For half a century, he has engaged, heart and soul, into the study of Chinese medicine.
