know sth. like the palm of one's hand

★汉语成语英译纵横谈... ... 了如指掌 know sth like the palm of one’s hand 井底之蛙 be like a frog at the bottom of a well ...

专业词汇在线翻译、医学专业在线词... ... 草血? knotwed 对某事了如指掌 know sth like the palm of one's hand 红大戟属 knoxia ...