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optional

/ˈɒpʃənəl/ /ˈɑːpʃənəl/

Meanings
noun

选修课，选修。

Something that is not compulsory, especially part of an academic course.

Examples :

"The history optional in the history course is a good choice for students who don't want to take the required course. "
历史课上的历史选修课对于不想上必修课的学生来说是个不错的选择。
education
noun

可选类型，可选项。

(sometimes capitalized) In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.

Examples :

"The program uses an optional parameter for the date of birth; it's not required for all users. "
这个程序使用一个可选类型参数来记录出生日期；并非所有用户都需要填写。
computing technology technical type language word

Related Words

Illustration required

required verb

/ɹɪˈkwaɪəd/ /ɹɪˈkwaɪɹd/

要求， 需求

"The teacher required the students to bring their textbooks to class every day. "

老师要求学生们每天上课都带课本。

Illustration students

students noun

/ˈstjuːdn̩ts/ /ˈstudn̩ts/

学生，学员

"He is a student of life."

他是一个在人生中不断学习的人。

Illustration something

something noun

/ˈsamθɪŋ/ /ˈsʌmθɪŋ/

东西，事物

"My friend told me there was something in the box, but I didn't know what it was yet. "

我朋友告诉我盒子里有东西，但我还不知道那是什么。

Illustration compulsory

compulsory noun

/kəmˈpʌlsəri/

必修课，义务。

"Attending the mandatory safety training is a compulsory requirement for all new employees. "

所有新员工都必须参加强制安全培训，这是一项硬性规定。

Illustration variable

variable noun

/ˈvɛəɹ.i.ə.bl̩/ /ˈvæɹ.i.ə.bl̩/

变量，变数.

"The amount of time it takes to finish my homework is a variable; sometimes it takes me an hour, other times it takes much longer. "

完成我的作业所需的时间是一个变量，有时我需要一个小时，有时则需要更长的时间。

Illustration especially

especially adverb

/əˈspɛʃ(ə)li/

特别，尤其。

"My sister is very helpful, especially when it comes to organizing things. "

我妹妹很乐于助人，尤其是在整理东西方面。

Illustration sometimes

sometimes adjective

/ˈsʌmtaɪmz/

以前的，之前的。

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

我以前的邻居，一位退休教师，偶尔还会去学校看看。

Illustration capitalized

capitalized verb

/ˈkæpɪtəˌlaɪzd/ /ˈkæpɪtlˌaɪzd/

大写，用大写字母书写。

"In German, all nouns are capitalized."

在德语中，所有的名词都要用大写字母开头。

Illustration programming

programming verb

/ˈpɹəʊɡɹəmɪŋ/ /ˈpɹoʊɡɹæmɪŋ/

编程, 编写程序

"He programmed the DVR to record his favorite show."

他编程设置了数字录像机来录他最喜欢的节目。

Illustration languages

languages noun

/ˈlæŋɡwɪd͡ʒɪz/

语言，文字。

"Deaf and mute people communicate using languages like ASL."

失聪和失语的人使用像美国手语这样的语言进行交流。

Illustration academic

academic noun

/ˌækəˈdɛmɪk/

柏拉图主义者，柏拉图学派的人。

"Professor Davies, a noted academic, explained the philosophical ideas of Plato to her students. "

戴维斯教授是一位著名的柏拉图学派学者，向她的学生们讲解了柏拉图的哲学思想。

Illustration parameter

parameter noun

/pəˈɹæm.ɪ.tə/

参数，参量

"To see how much sunlight a plant needs, the amount of water given to each plant was a parameter that was kept constant. "

为了观察植物需要多少阳光，给每棵植物浇的水量是一个参数，在这个实验中保持不变，但在其他实验中可能会改变。