Many practitioners have a sliding scale of fees.许多从业者都采用浮动制计费。Breakfast is included in the price, but room service is extra. 早餐包括在总价中，但客房服务另外计费。We plan to computerize our billing system.我们打算用电脑来计费。In regular telegrams the rate is per word.普通电报是按字计费的。