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normal

/ˈnɔːməl/ /ˈnɔɹməl/

Meanings
noun

法线，正规线。

A line or vector that is perpendicular to another line, surface, or plane.

Examples :

"The carpenter used a T-square to draw a normal to the edge of the wooden board. "
木匠用丁字尺在木板边缘画了一条法线。
math physics technical essential ielts
adjective

简正， 常规。

(of a mode in an oscillating system) In which all parts of an object vibrate at the same frequency (see normal mode).

Examples :

"The tuning fork vibrated at a normal frequency, making a consistent tone. "
这个音叉以一个简正频率振动，发出了稳定的音调。(Zhège yīncā yǐ yī gè jiǎnzheng pínlǜ zhèndòng, fāchū le wěndìng de yīndiào.)
physics frequency system sound essential ielts

Related Words

Illustration mainstream

mainstream noun

/ˈmeɪnstriːm/ /ˈmeɪnˌstriːm/

主流，大流。

"The mainstream of the conversation at the family dinner was about the kids' school play. "

家庭晚餐上，大家谈论的焦点主要集中在孩子们的学校戏剧表演上。

Illustration perpendicular

perpendicular noun

/ˌpɜː.pənˈdɪk.jə.lə(ɹ)/ /pɝ.pənˈdɪk.jə.lɚ/

垂线，垂直线。

"The perpendicular to the wall supported the shelf. "

那根垂直于墙面的支撑物托住了架子。

Illustration hydrocarbon

hydrocarbon noun

/ˈhaɪdroʊˌkɑːrbən/ /ˈhaɪdrəˌkɑːrbən/

碳氢化合物，烃。

"Gasoline is a hydrocarbon fuel used in many cars. "

汽油是一种碳氢燃料，很多汽车都在使用。

Illustration grandmother

grandmother noun

/ˈɡɹæn(d)ˌmʌðə(r)/ /ˈɡɹæn(d)ˌmʌðɚ/

奶奶，外婆

"My grandmother taught me how to bake cookies when I was a child. "

我小时候，奶奶/外婆教我怎么烤饼干。

Illustration containing

containing verb

/kənˈteɪnɪŋ/

包含，容纳。

"The box containing my old toys was stored in the attic. "

装有我旧玩具的箱子被储存在阁楼里。

Illustration consistent

consistent noun

/kənˈsɪstənt/

一致性, 连贯性

"The consistent of the student's grades showed a steady improvement throughout the year. "

学生的成绩一致性表明，全年都在稳步提高。

Illustration describing

describing verb

/dɪˈskraɪbɪŋ/

描述，描写。

"The feeling is difficult to describe, but not unpleasant."

这种感觉很难用语言描述，但并不令人不快。

Illustration oscillating

oscillating verb

/ˈɑsɪˌleɪtɪŋ/ /ˈɑsəˌleɪtɪŋ/

摆动，振荡。

"A pendulum oscillates slower as it gets longer."

钟摆越长，摆动得越慢。

Illustration equivalent

equivalent noun

/ɪˈkwɪvələnt/

等价物，同等物

"A pound of apples is the equivalent of two dollars at the market. "

在市场上，一磅苹果相当于两美元的价值。

Illustration lifestyles

lifestyles noun

/ˈlaɪfˌstaɪlz/

生活方式，生活形态。

"The students' different lifestyles were reflected in their choices of extracurricular activities. "

这些学生的生活方式不同，从他们选择的课外活动就能看出来。

Illustration alternative

alternative noun

/ɒl.ˈtɜː(ɹ).nə.tɪv/ /ɔl.ˈtɝ.nə.tɪv/

选择，选项。

"The school offered an alternative schedule for students who needed more time to study. "

学校为需要更多时间学习的学生提供了一个备选时间表。

Illustration substituent

substituent noun

[sʌbˈstɪtʃuənt]

取代基，取代物

"The chemist replaced the chlorine substituent in the molecule with a bromine substituent. "

这位化学家将分子中的氯取代基替换成了溴取代基。