The service tier is designed as a service facade.

服务层被设计为服务facade。

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The purpose of the service tier is to separate service provision from service implementation.

服务层的目的是分离服务供应与服务实现。

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We recommend that you install the index data service in the data tier.

我们建议您在数据层安装索引数据服务。

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Despite these initiatives, the mobile carriers still lack the infrastructure necessary to deliver premium video services at a level of QoE that corresponds to the subscriber fees or service tier.

FORBES: Why The Future Of Video Depends On The Mobile Carriers

To help customers understand how this service can be used with their applications, AWS is providing a free tier of service, in which up to the first 20 minutes of content transcoded each month is provided free of charge.

ENGADGET: Amazon wants to make your hi-res videos mobile-friendly with Elastic Transcoder

Doctors have warned that plans to free the top-rated hospitals from government control runs the risk of creating a two-tier health service.

BBC: Consultants back strike ballot