optional

Certain courses are compulsory, others are optional.

某些课程是必修的，其他是选修的。

牛津词典

This model comes with a number of optional extras (= things you can choose to have but which you will have to pay extra for) .

这一型号有一系列可供选择的附件，价格另计。

牛津词典

A holiday isn't an optional extra. In this stressful, frantic world it's a must...

休假并非可有可无。在这个紧张而忙碌的世界，它是必不可少的。

Sex education is a sensitive area for some parents, and thus it should remain optional.

性教育对某些家长而言是个敏感领域，因此应该保持其非强制性。

Airfield: 4 Firehawks, which is enough to destroy an opposing Tech are optional.

机场: 4个火鹰, 这足够您摧毁敌人得高科了,云层推进升级可选.

期刊摘选

Appends the specified element of List ( optional operation ).

在列表尾部添加指定元素 ( 可选操作 ).

期刊摘选

The appearance of two new optional color effect: soil and grass green bronze.

对于外观,有两种新的效果色可选: 土青铜色与草绿色.

期刊摘选

On lesser amounts, insurance is recommended but optional and taken out at your request.

在少许数额, 保险被推荐但任意和被去掉根据您的请求.

期刊摘选

However, the alt attribute is optional and may be omitted from particular image elements.

然而, alt的属性是可选的,甚至是可以忽略的.

期刊摘选

A general categorization ( optional ). Negative, epithelial cell abnormality, or other ( see interpretation below ).

大体分类 ( 可选择项 ). 正常, 或上皮细胞异常, 或其他 ( 参看以下描述 )

期刊摘选

Constructors have optional extra parameters for the comparison object.

构造函数有可选的额外参数用于比较用的函数对象.

期刊摘选

The optional wind deflector minimizes drafts and wind turbulence, eliminating wind chill and maximising comfort.

作为备选设备的挡风板也以有效的防止气流干扰, 消除风冷,优化舒适度.

期刊摘选

Air pressure type cooling device are optional parts by customers.

可依客户需求增设气冷式冷却设备.

期刊摘选

Black polyester paint; optional in other special paints on request.

黑色聚脂漆; 按订货要求可选用其它专门的油漆.

期刊摘选

The cassette player is an optional extra in this make of car.

这种型号汽车如需盒式磁带唱机费用另计.

期刊摘选

Automatic thread trimmer ( optional ), to increase sewing efficiency and reducing production cost.

备有自动 切线 机型, 可增加缝制效率降低成本.

期刊摘选

There are a range of optional units available depending upon work role and work setting.

有一系列的可选单元可根据工作的职责和工作设置而定.

期刊摘选

In this first form, the comma following the parameter declarations is optional.

在第一种形式中, 形参声明后面的逗号是可选的.

期刊摘选

A variable automatic transmission , Mitsubishi's first , will be optional.

同时也有一款无极变速器作为可选配置.

期刊摘选

Optional argument which specifies what target to build in the subproject.

可选参数用来指定子项目将要构建什么目标.

期刊摘选

Checks authorization for the given operation context and optional message.

检查给定操作上下文和可选消息的授权.

期刊摘选

Solid Stellite 6 wedge ( optional ) ensures low friction and long service life.

实心钨铬钴合金6楔板 ( 选项 ) 确保较低的磨损和较长的使用寿命.

期刊摘选

The goods are optional, but only one.

这些物品是可以任选的, 但只能选一个.

《简明英汉词典》

It is optional with you.

那是你的自由.

《现代英汉综合大词典》

Attendance at the lecture is optional.

这一讲座可随意参加.

《现代英汉综合大词典》

The course consists of ten core modules and five optional modules.

这门课程包括十个必修单元和五个选修单元。

《牛津高阶英汉双解词典》

Certain courses are compulsory, others are optional.

某些课程是必修的，其他是选修的。

《牛津高阶英汉双解词典》

A holiday isn't an optional extra. In this stressful, frantic world it's a must.

休假并非可有可无。在这个紧张而忙碌的世界，它是必不可少的。

柯林斯例句