A non-essential additional item which is available for purchase.
（可买可不买的）附件，额外配件
Example sentencesExamples
The multicolour seat, featured in the previous model, continues to be available as an optional extra.
But for the cars that seem to have everything, there are some optional extras available.
Another optional extra is a video of the flight, captured on an in-flight camera.
It is available as an optional extra for 2.0-litre models and above.
There are also a few optional extras available including seat warmers and a keyless entry system.
Automatic window wipers and folding, electrically heated door mirrors are optional extras.
Sauces and side orders are an optional extra, but sometimes the large, beautiful portions are quite enough by themselves.
Also fairly impressive is the list of optional extras available for this American built machine.
The system is available as an optional extra on the latest SLK-Class roadster which goes on sale here in the summer.
The problem had been selecting the optional extras.
A range of optional extras is available enabling a client to configure a system that best suits needs.
On top of this, an electronic climate control, normally an optional extra costing £800, is available at a cut price of £250.
Over the past 18 months almost every car manufacturer has begun including adaptive headlamps in its list of optional extras.
The test car was fitted with plenty of optional extras.
Gloves were not an optional extra - they were as essential to your outfit as the right shoes or bag.
It makes sense that the more optional extras you go for, the heavier the vehicle will be.
This was supplied with new kits and made available as an optional extra for existing aircraft.
Lunch available in Stradbally is an optional extra.
Sales and marketing director Tracey Brady says: ‘We want to provide our customers with a wide choice of quality optional extras that will help them create their dream home.’
The strap is an optional extra; you often see adverts for personalized ones in the papers, although plenty of luggage shops like Salisburys sell them.