名词
中文翻译：额外成本
同义词：
['extra charge', 'additional expense', 'extra cost']
例句：
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1. Thehotel charges an additional 10% for a room upgrade.
酒店为房间升级收取额外的10%。
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2. The project requires an additional $50,000 in materials.
这个项目需要额外的5万美元材料费。
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3.The company has added an additional salesperson to its team.
公司已经增加了一名销售人员到其团队中。