an amount of money that is added to a bill, as an extra charge for a service（另加的）服务费
That will be $50, plus a service charge of $2.50.您消费 50 美元，另加 2.50 美元的服务费。🔊🔊
(British English)an amount of money that is added to a bill in a restaurant, for example 10 per cent of the total, that goes to pay for the work of the staff（付给餐馆侍者的）小费，服务费
an amount of money that is paid to the owner of an apartment building for services such as putting out rubbish, cleaning the stairs, etc.（付给房东的）服务费，清洁费