[畅所欲言 / 暢所慾言, chàng suǒ yù yánㄔㄤˋ ㄙㄨㄛˇ ㄩˋ ㄧㄢˊ] lit. fluently saying all one wants (成语 saw); to preach freely on one's favorite topic; to hold forth to one's heart's content#24170
[滚瓜烂熟 / 滾瓜爛熟, gǔn guā làn shúㄍㄨㄣˇ ㄍㄨㄚ ㄌㄢˋ ㄕㄨˊ] lit. ripe as a melon that rolls from its vine (成语 saw); fig. to know fluently; to know sth inside-out; to know sth by heart#73694