1 extra /ˈɛkstrə/ adjective Learner's definition of EXTRA
1
always used before a noun : more than is usual or necessary : additional额外的;外加的;附加的 -
a sandwich with extra mayonnaise多加蛋黄酱的三明治
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She got a part-time job to earn some extra money.她为了多挣些钱做了份兼职。
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He gave us an extra week to finish the job.他多给我们一个星期来完成这项工作。
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There's no extra charge for breakfast.早餐不另收费。
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Room service is/costs an extra $5. = You have to pay an extra $5 for room service.客房服务需另付5美元。
2
: costing more : requiring additional payment另外收费的
go the extra mile
— see mile