名词
中文翻译：可选的港口费用
同义词：
['optional fee', 'optional charge例句：1. The hotel chargesan additional $20 for a roomwith a view.（酒店为带景观的房间额外收取20美元。）2. Theairline offers a discount onthe cost of tickets if youbook in advance.（航空公司提前预订机票可以享受折扣。）3. The restaurant has an optionalwine list', 'so you can choose froma variety of wines.（餐厅提供可选的葡萄酒单，你可以从多种葡萄酒中选择。）']
例句：
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1. The hotel chargesan additional $20 for a roomwith a view.
酒店为带景观的房间额外收取20美元。
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2. Theairline offers a discount onthe cost of tickets if youbook in advance.
航空公司提前预订机票可以享受折扣。
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3. The restaurant has an optionalwine list, so you can choose froma variety of wines.
餐厅提供可选的葡萄酒单，你可以从多种葡萄酒中选择。