Word · Frequency #21952
tangent
切线
核心释义
a line that touches a curve at only one point
- 1.
与曲线在一点相切而不交叉的直线
A straight line touching a curve at a single point without crossing it there.
- 2.
角的函数,给出正弦与余弦的比值,符号:tan, tg
A function of an angle that gives the ratio of the sine to the cosine, in either the real or complex numbers. Symbols: tan, tg.
- 3.
与主要话题几乎无关但有共同点的话题
A topic nearly unrelated to the main topic, but having a point in common with it.
- 4.
两条或多条线或边之间的视觉交互,常常是艺术家未预料到的关系
A visual interaction between two or more lines or edges that creates a perceived relationship between them, often in a way that the artist did not intend.
- 5.
古钢琴中击打琴弦发声的小金属片
A small metal blade in a clavichord that strikes the strings to produce sound.
正切（函数）；离题；跑题；视觉相切；击弦片；与曲线在一点相切而不交叉的直线
用法In use
We were discussing the budget when she suddenly went off on a tangent about her vacation.
用法提示：tangent 为名词，在短语 go off on a tangent 中表示“跑题、偏离主题”。
His speech started well, but he kept going off on tangents that confused the audience.
用法提示：tangent 的复数形式 tangents 作介词宾语，指偏离主题的话题。
Please avoid tangents during the meeting so we can finish on time.
用法提示：tangent 的复数形式作动词 avoid 的宾语，指偏离主题的内容。
相关词与表达Connections
搭配Collocations
- go off on a tangent
- 突然离题；跑题
- When she mentioned his ex, he went off on a tangent about his new job.她一提到他的前任，他就开始跑题聊他的新工作。
- tangent line
- 切线
- The tangent line touches the circle at exactly one point.切线恰好与圆相交于一点。
- tangent function
- 正切函数
- In trigonometry class, we learned to graph the tangent function.三角函数课上，我们学习了绘制正切函数的图像。
习语与比喻表达Idioms & figurative uses
- go off on a tangent
- 突然岔开话题；偏离主题
学习提示Learner notes
记忆技巧Memory Tip
联想：'tangent' 开头是 tan（正切符号），几何里切线一触即离；聊着聊着跑题也像从主线“切”出去。记住 tan 就能想起“切线/正切/跑题”三种意思。
语境与语域Context & Register
语域：formal 常见场景：geometry class、math textbook、academic paper 作“切线”解时，通常用于数学或几何等正式语境，多出现在教科书、课堂或论文中，属于专业术语，语气正式。若指“跑题”等义项，则可能更口语化。
语法说明Grammar Note
数学中指导数或切线；引申义指突然转变话题，常用短语 go off on a tangent.
发音与拼写Pronunciation & Spelling
发音上，tangent 与 agent、urgent、diligent、intelligent、emergent、pungent 都有相同的非重读尾音 /dʒənt/，且拼写都含 -gent；但重音所在的元音不同，所以它们不是严格意义上的韵词。注意拼写相似但读音不同的词：如 'tangent' 的 'tang' 读 /tæŋ/，而 'tangle' 读 /ˈtæŋɡəl/，'tangible' 读 /ˈtændʒəbəl/ 等。
一起学习词形Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.