ex‧tra 1 S1 W2 / ekstrə / 形容词

1 [仅用于名词前] more of something, in addition to the usual or standard amount or number :

Could you get an extra loaf of bread?

Allow extra time for your journey.

Drivers are advised to take extra care .

Residents can use the gym at no extra cost .

an extra ten minutes/three metres etc

I asked for an extra two weeks to finish the work.

2 [名词前不用] if something is extra, it is not included in the price of something and you have to pay more for it 反义词 included :

Dinner costs $15 but wine is extra.

THESAURUS

extra in addition to the usual or standard cost, time, amount etc : They let the kids stay up an extra hour. | Some stores charge extra for delivery. | Postage is extra.

additional [仅用于名词前] more than the basic amount or the amount that you expected or agreed. Additional is more formal than extra : An evening job would provide additional income. | There may be an additonal charge for paying bills by credit card.

added [仅用于名词前] extra – used when talking about something that makes something better or more effective : an added benefit | an added precaution | It was a beautiful place, and the good weather was an added bonus . | Use a sunscreen for added protection.

spare [仅用于名词前] kept in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etc : a spare key | a spare tyre | a spare set of clothes