In a hosted environment, attempts to invoke hosted Web services will be denied if a valid contract to use those services does not exist.

在托管的环境中，如果不存在使用这些服务的有效合同，则试图调用托管的Web服务将被拒绝。

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At a minimum, the existence of a contract would serve as an authorization check; without a valid contract, the service cannot be invoked.

最低限度，合同的存在将起到授权核查的作用；如果没有有效的合同，将不能调用服务。

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To create a valid contract an offer must be accepted without qualifications.

只有毫无保留地接受要约才能成立一个有效的合同。

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The club appealed against their punishment, claiming that Kakuta did not have a valid contract with the French club.

BBC: Chelsea's Gael Kakuta secures Fulham loan move

Entrants may only register a mobile phone for which they have a valid telephony contract.

CNN: Euro 2008 SMS Alerts Terms & Conditions

All the players bought from the auction in Mumbai will be given a one-year contract valid until 31 December which will also cover a Champions League Twenty20 tournament later this year.

BBC: Eoin Morgan seals Bangalore IPL deal