positive writhe
collocation正拧数
A right-handed trefoil knot has a positive writhe.
右手三叶结具有正拧数。
拧数；纽结正负交叉数之差
先理解核心含义，再看它在真实句子里的用法。
拧数；纽结正负交叉数之差
The number of negative crossings subtracted from the number of positive crossings in a knot.
The writhe of this knot is a simple integer that helps distinguish it from its mirror image.
这个纽结的拧数是一个简单的整数，有助于将它与其镜像区分开来。
拧数
The number of negative crossings subtracted from the number of positive crossings in a knot
To calculate the writhe, count each positive crossing as +1 and each negative crossing as −1.
要计算拧数，将每个正交叉点计为 +1，每个负交叉点计为 −1。
These two diagrams have the same writhe even though they look quite different.
这两个图示虽然看起来很不相同，却有相同的拧数。
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正拧数
A right-handed trefoil knot has a positive writhe.
右手三叶结具有正拧数。
负拧数
A left-handed trefoil knot has a negative writhe.
左手三叶结具有负拧数。
总拧数
The total writhe is calculated by adding the signs of all crossings.
总拧数通过将所有交叉点的符号相加来计算。
纽结的拧数
The writhe of a knot is the number of positive crossings minus the number of negative crossings.
纽结的拧数是正交叉数减去负交叉数。
Use writhe naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
writhe 本义为“扭动”，纽结中正负交叉相抵的数目就是拧数：记住“扭动”便记住“拧数”。
语域：formal 常见场景：knot theory、mathematical writing 这个词作名词时是纽结理论中的专业术语，通常出现在学术论文或数学教材中，属于正式用法，日常口语中很少使用。
同韵词（与 writhe /raɪð/ 押韵）：blithe、lithe、scythe、tithe 都读 /aɪð/，且拼写均以 -the 结尾。形近词：write /raɪt/ 和 wreath /riːθ/ 虽以 wr- 开头，但发音不同——write 的结尾是 /t/，wreath 的元音是 /iː/ 且结尾是清音 /θ/，均不与 writhe 押韵，注意区分。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.