乐此不疲

HSK 7-9

lècǐ-bùpí

take pleasure in it without getting tired of it; never tire of (doing)

他对研究乐此不疲

tā duì yánjiū lècǐ-bùpí

He was痴迷于研究

我乐此不疲地学习中文

wǒ lècǐ-bùpí de xuéxí Zhōngwén

I studied Chinese with great enthusiasm.

她总是乐此不疲地帮人

tā zǒngshì lècǐ-bùpí de bāng rén

She always helped people with great enthusiasm.