大家都搜：
任选附件，任选配件
1、optional course───选修课，选修课程
2、optional courses───选修课（optionalcourse的复数）；选修课（optional course的复数）
3、optional chains───可选链条
4、optional up───可选向上
5、optional───adj.可选择的，随意的
6、decidedly optional───绝对可选
7、extras───n.附加设备；额外部分；另外收费的部分（extra的复数）
8、optional gre───选修gre
9、optional map───可选地图
1、Decisions about optional extras, too, are about showing off, he says.───毛千萍表示，在决定要不要那些可有可无的配饰时，炫耀心理也在起作用。
2、Essentially, the only difference in models was either optional extras or the number of feeders available.───基本上，唯一的区别在模型要么额外或可选的人数馈线可用。
3、The lesson for Brazil will be not to get too ambitious with the "optional extras" when it comes to preparing for the World Cup and Olympics.───巴西将得到一个教训：筹办世界杯和奥运会时，不要对“可有可无的锦上添花工程”抱过大雄心。
4、But thankfully, 007 has a few optional extras installed in his Lotus Esprit.───但值得庆幸的是，007有一些额外的安装可选他的莲花精神。
5、Optional extras include a computer-controlled catalytic converter and advanced ABS.───附加的配置有电掌控的催化剂逆流器以及先进的ABS功能。
6、The basic menus are still decided at compile time -- runtime changes simply modify the optional extras.───基本的菜单仍然在编译时确定--运行时仅仅改变额外的可选项。
7、Optional extras include cooking classes at a top restaurant.───可选的额外之物包括一家高级餐馆的烹饪课程。
1、Made to measure in glass fibre with toughened glass roof and sides, optional extras include ventilation and double glazing.
2、Tinted windows and a sunroof are optional extras .
3、This model comes with a number of optional extras .
4、Most of the systems offer optional extras.
5、Cruising chutes and Windsurfers are available as optional extras on some yachts.
6、Optional extras include anti-lock brakes and an electric sunroof.
7、Optional extras include cooking tuition at a top restaurant.
8、Theories are not optional extras in science.