solely engrossed in one thing; just (one thing, no need to worry about the rest); simply; by all means; please feel free; do not hesitate (to ask for sth)[cedict]
学习
xué xíㄒㄩㄝˊ ㄒㄧˊ
to learn; to study[cedict]
吃喝玩乐
chī hē wán lèㄔ ㄏㄜ ㄨㄢˊ ㄌㄜˋ
eat, drink and be merry (成语 saw); to abandon oneself to a life of pleasure[cedict]