tangent

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柯林斯词典

tangent /ˈtændʒənt/ (tangents)

1. N-COUNT A tangent is a line that touches the edge of a curve or circle at one point, but does not cross it. 切线
2. PHRASE If someone goes off on a tangent, they start saying or doing something that is not directly connected with what they were saying or doing before. 突然离题[V and N inflect]
The conversation went off on a tangent. 谈话突然偏离了正题。

剑桥词典

tangent noun [C] (CIRCLE)

tangent noun [C] (TRIANGLE)

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