名词
中文翻译：额外费用
同义词：
['additional charge', 'surcharge', 'additional fee']
例句：
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1.The hotel charges an extra $20 for a room upgrade.
酒店为房间升级额外收取20美元。
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2. The airline has added an extra flight to our route.
航空公司已经增加了我们航线的额外航班。
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3.The restaurant charged an extra 10% on the meal we ordered.
餐厅在我们点的食物上额外加了10%。