it's not easy to follow her think because she's always go off at a tangent 要跟上她的思路并非易事,因為她老是突然扯到題外去。
the teacher was telling us about the poet's life, when he went off at a tangent and started talking about his war experiences 老師在給我們講述詩人生平故事的時候,突然把話題一轉,講開他自己的戰(zhàn)爭經(jīng)歷來了。