Tangent refers to a line or plane that touches a curve or surface at a single point without crossing it. It can also mean to deviate abruptly from a subject.
Tangent 的意思是与直线相交于一点的线或平面，且在这一点上不改变方向。它也可以指突然偏离主题。
| 正面 | tangent |
|---|---|
| 背面 | n. [数] 切线，[数] 正切 go(fly) off at a tangent 突然改变行动 |
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