The car comes with many optional extras such as radio and cigarette lighter.这辆汽车配有很多可选附件, 比如收音机和点烟器等。

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。