What is the translation of " OPTIONAL " in Chinese?

• 任择
• 可选
• 一个可选
• 任选
• 选修

Examples of using Optional in English and their translations into Chinese

Optional Protocol.
任择议定书.

Additional Optional Hotel Costs.
酒店选项额外费用.

Optional Protocols.
任择议定书.

But this step is optional, do it at your leisure.
但是这个步骤是任选的，这样做在你的休闲。

Optional Personal Data.
选个人数据.

The result is an Optional holding the reduced value.
结果是一个Optional持有缩小后的值。

Optional(one or more).
必选（1个或多个）.

Articles of the Optional Protocol: 5, paragraph 2(b).
根据任择议定书第五条第4款通过了如下的：.

The device 20 can comprise a number of additional optional features.
装置20可包括许多附加的任选特征。

The Optional Protocol.
任择议定书.

The rooms of the ground floor have an optional private kitchen.
地面层的房间是一个可选的私人美食。

Other optional amendments.
其他备选修正.

Priority should therefore be given to the elaboration of such an optional protocol.
固此，应将制订这样一个任择议定书放在优先地位。

An Optional Hunting Quest.
一可选狩猎任务.

Article 7 bis, which provided for optional participation, was unacceptable.
第7条之二规定任选参加，这是不能接受的。

Optional Qualifications(conform to one of the following three conditions).
选项条件（符合以下三个条件之一）.

IsPermaLink is optional, its default value is true.
IsPermaLink是可选属性，默认值为真。

We will have no responsibility under the use of third parties optional tools.
对于使用可选的第三方工具，我们不承担任何责任。

Other optional proposals by the EU.
欧盟的其他备选提议.

At the international level the Optional Protocol has not yet gone into effect.
目前在国际上该任择议定书尚未正式生效。

In the optional paper is to pay attention to the paper surface tension requirements.
在选购纸张是要注意对纸张表面张力的要求。

It is important that discussions over the optional protocol do not lead to procrastination.
重要的是对该任择议定书的讨论不会导致延误。

Optional modules may include Language and the Mind, Language Acquisition and Forensic Linguistics.
可选配模块包括语言和心灵，语言习得和法律语言学。

Computer/Printer@(optional, where possible or feasible).
电脑/打印机@(备选，视是否可能或可行而定).

Facsimile@(optional, where possible or feasible).
传真@(备选，视是否可能或可行而定).

Ultra-bright display is an optional feature that must be installed at the factory.
超亮显示屏是一项可选功能，必须在出厂时安装。

Uniforms, books, optional activities, and individual needs are not included.
校服，书籍，自费活动和个人的需要不包括在内。

Mobile Broadband is an optional feature and requires factory configuration.
移动宽带为选配功能，需要出厂配置。

Student choose two optional modules, taking one in each semester.
学生选择两个选修模块，每学期选修一个。