一些供应商一次性收取500美元的费用（广告预算除外），而其他的除了收取一定的费用外还要按广告费用的百分比进行提成。
Some vendors charge a one-time fee of $500 (in addition to the ad budget), while others charge a fee and receive a percentage of the ad spending.
您可能会思忖提供免费的在线游戏并只收取一次性费用这种业务模型是否可行。
You might wonder whether the business model of offering free online play, supported solely by one-time box revenue, is viable.
结果，一些环保主义者如今正在呼吁对每只一次性购物袋收取高15便士的费用。
As a result, some environmentalists are now calling for a charge of up to 15 pence for each disposable carrier bag.
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