We provide a multi - type queueing system, including vacation, feedback and optional services.

建立了休假、反馈、可选服务多类型相结合的排队模型。

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It also includes "optional services startup" feature where the developers can selectively start only the server components they really use in their applications.

还包括一个“可选的启动服务”特性，以便开发者可以在应用中开启其真正需要的那些服务组件。

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Right now their core product is free, but in the future some additional optional services including development support and monetization opportunities will be added.

目前他们的核心产品是免费的，但是未来会增加一些附加可选的服务，其中包括开发支持，提供赚钱机会（monetization opportunities）。

youdao

Services offered by Visa consists primarily of optional services such as extended cardholder protection and concierge services, cardholder services and fees for licensing and certification.

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One final note for IT departments: Dell wants to make it easy for you to deploy their products at your company, and they offer a variety of optional enterprise services like Trusted Platform Module for BitLocker data encryption, static imaging and asset tagging, and custom images.

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The company hopes one day to make money by offering users optional fee-based services from others.

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