in addition; more than is usual, expected or exists already额外；另外◆You pay a little extra for their overnight delivery service.他们的隔夜交货服务需要额外收取少许费用。◆The rate for a room is €50, but breakfast is extra.房费为 50 欧元，早餐另付。⨁to charge / cost / pay extra收取／花费／支付额外费用 (used with an adjective or adverb 与形容词或副词连用) more than usually特别；格外◆an extra-large T-shirt特大号 T 恤衫