乐此不疲
lècǐbùpí
=
乐
+
此
+
不
+
疲
Idiom, Proverb or Saying: enjoy sth and never tire of it
eg.
j/1349#
⇐
乐此不疲lècǐbùpí = 乐 + 此 + 不 + 疲