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ADJ
额外的;外加的
You use extra to describe an amount, person, or thing that is added to others of the same kind, or that can be added to others of the same kind.
例句
Police warned motorists to allow extra time to get to work...
警方告诫驾车者出门上班要留出富余时间。
Extra staff have been taken on to cover busy periods...
额外雇用了一些员工来应付繁忙时期。
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ADJ
费用另计的；额外收费的
If something is extra, you have to pay more money for it in addition to what you are already paying for something.
例句
For foreign orders postage is extra...
国外订单邮费另计。
The price of your meal is extra.
你的餐费另计。
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N-COUNT
额外费用
Extras are additional amounts of money that are added to the price that you have to pay for something.
例句
She is disgusted by big hotels adding so many extras to the bill that it nearly doubles...
她非常厌恶大酒店额外收取这么多费用，账单金额都快翻倍了。
There are no hidden extras.
没有隐性的额外费用。
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N-COUNT
额外之物;附加物
Extras are things which are not necessary in a situation, activity, or object, but which make it more comfortable, useful, or enjoyable.
例句
Optional extras include cooking tuition at a top restaurant...
可选的额外项目包括在顶级餐厅学习厨艺。
They are also spending much less on extras like meals in restaurants.
他们花在下馆子等额外消费上的钱也少多了。
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N-COUNT
（电影中的）临时演员，群众演员
The extras in a film are the people who play unimportant parts, for example as members of a crowd.
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ADV
格外;特别
You can use extra in front of adjectives and adverbs to emphasize the quality that they are describing.
例句
I'd have to be extra careful...
我不得不格外小心。
What makes a magnificent garden extra special?...
是什么让华丽的花园格外特别？