如果提供商提供一份标准格式合同(通常的惯例是这样的)，那么你必须对所有的条款和条件都十分地清楚。
If the vendor provides a standard form of contract (which is a general practice), then you must be must be fully aware of all the terms and conditions.
合同涵盖了服务惯例的所有属性以及提供者和请求者如何对其进行使用，它的订立为计量服务的使用建立了基础。
The contract lays the foundation for metering the services to be used, by covering all the attributes of the service customs and how they shall be employed by provider and requestor.
为公司工作两年的临时工或其他性质工人按惯例可以将他们的合约替换为永久性合同。
Temporary and other workers who have worked for a company for two years are normally able to upgrade their contracts to permanent status.
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