向下兼容性将在9版本中移除。
向下兼容性是指一个高级系统与一个较低级系统相互配介的能力。
Downward compatibility means the capability of an advanced system to interact with a lesser advanced one.
提供对之前发行版中组件、模板、触发器及其它扩展的向下兼容性。
Deliver backwards compatibility with previous releases of components, templates, modules and other extensions.
QueryInterface提供了一个强大的机制来维护向下兼容性。
QueryInterface provides a great mechanism for maintaining backwards compatibility between versions of an object.
改进还没有投入使用的服务肯定是很容易的，但是当你考虑服务的版本以及向下兼容性时，你才能不断地交付有用的服务。
It is certainly easier to grow services that haven't been pushed in to production but if you version your services and account for backward compatibility you can deliver usable services incrementally.
制造商在开发新的硬件和软件时都力图保持向下兼容性，因为它避免了用户在升级到新版本时，每次从头做起。
Manufacturers strive to maintain downward compatiblity when they develop new hardware and software, because it avoids the need for users to start from scratch every time they upgrade to a new version.
制造商在开发新的硬件和软件时都力图保持向下兼容性，因为它避免了用户在升级到新版本时，每次从头做起。
Manufacturers strive to maintain downward compatiblity when they develop new hardware and software, because it avoids the need for users to start from scratch every time they upgrade to a new version.
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