optional是什么意思_音标_用法_例句

简单释义：

adj. 可选择的；选修的

n. 〈美〉选修科

网络 非强制的；可选的；可以任选的

完整释义：

adj.

1.可自由选择的;随意的,任意的;非强制的
2.可供选择的
3.选修的
4.任选的
5.可自行决定的
6.非强制性的
7.备用的

n.

1.选择性
2.自选动作
3.〔美国〕选修科
4.任意

例句：

1. The structure and validity of the MDMP must also be examined as the metric to which optional decision-making processes are compared.
   军事决策程序MDMP的结构和有效性同样要作为可选的决策程序相对比的衡量标准来检验。

2. They had a special offer for a Sony VAIO, which had a very nice large screen and space for an optional second battery.
   他们有一个SonyVAIO的特别提供，它有一个非常好的大萤幕以及额外的第二颗电池的空间。

3. After a join hint is specified, the INNER keyword is no longer optional and must be explicitly stated for an INNER JOIN to be performed.
   指定联接提示后，要执行INNERJOIN时，INNER关键字不再为可选，而必须显式说明。

4. That noted, it seems to me that optional tips are an attractive way of doing business.
   鉴于此，我觉得随意小费制是个有吸引力的办法。

5. "Moving three evictions , optional neighbouring states, " the importance of education has always been a traditional Chinese virtue.
   “孟母三迁，择邻而居”，重视教育一直是中国的一个传统美德。

6. In fact, for one-to-one associations that are optional on both end, the code generated by the wizard is all we need.
   实际上，对于两端都可选的一对一关联，只需要向导生成的代码就够了。

7. sed takes a script of any number of commands followed by an optional input filespec; by default, it reads standard input.
   sed接受包含任何数量命令的脚本，后面跟着可选的指定输入文件的选项；缺省情况下，它读取标准输入。

8. The terms included in DCMI are divided into a minimal set of base elements and an optional collection of refinements to these base elements.
   DCMI中的术语被划分成最小化的基本元素集和对这些基本元素细化的可选集。