at one's fingertips
... you are carrying your joke too far.你打趣开患上太甚度了。 at one's fingertips洞若观火 kill time丁宁时间 ...
at one's finger's tips
... as mod as sb. 与某人一样摩登 at one's finger's tips 洞若观火 at sixes and sevens 紊乱的 ...
洞若观火,汉语成语,拼音是dòng ruò guān huǒ。意思是形容观察事物非常清楚,好像看火一样。出自《尚书·盘庚上》。