Similarly, access to fee-based services can also be controlled based on roles to ensure proper use of services.
类似地，还可以根据角色控制对收费服务的访问，以确保对服务的适当使用。
When fee-based services are involved, I will charge a fair and reasonable fee based on the amount of time and skill required.
当收费服务很少，我将收取公平和合理费用后的时间和技能所需数额为基础。
At this point in my investigation, I wanted to see how much I could find for nothing — or next to nothing — before resorting to fee-based services.
依据这样的想法进行调查，我想知道在诉诸付费服务之前能免费或几乎免费找到多少信息。
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