fly off on a tangent的用法和樣例：
例句
(ph.)
- We were discussing last night's concert when Anna went off at a tangent and started talking about her new flat.
當我們正討論昨晚的音樂(lè )會(huì )時(shí)，安娜突然離開(kāi)話(huà)題，開(kāi)始談起她的新公寓來(lái)了。 - It is difficult to have a sensible discussion with my mother because she's always flying off at a tangent and talking about something else.
同我母親進(jìn)行有成效的討論很困難，因為她總是突然離開(kāi)話(huà)題，扯到其它一些事情上去。
