
好词典

源自拉丁语 'tangentem'(接触),经由古法语 'tangente' 进入英语。
❶ 在数学中,指与曲线或曲面仅接触于一点的直线,用于描述几何关系。
“The line is tangent to the circle at point P.”
(这条直线在点P处与圆相切。)
“Draw a tangent to the curve at this point.”
(在这点上画一条曲线的切线。)
❶ 比喻突然偏离主题的言论或行为,常指谈话中突然转到无关的话题。
“He went off on a tangent about his vacation during the meeting.”
(他在会议上突然岔开话题,谈起了他的假期。)
“Her mind often wanders off on tangents during conversations.”
(她在谈话中经常走神,偏离主题。)
go off on a tangent — 突然偏离主题,开始谈论无关的事情。
“During the lecture, the professor went off on a tangent about his childhood.”
(在讲座中,教授突然跑题,谈起了他的童年。)