如果主服务器不可用，但客户机尚具有网络连接，就需要故障转换到备用服务器，而不是使用系统时间。

If the primary server is unavailable, but the client still has network connectivity, you want to fail over to a secondary server as opposed to using system time.

youdao

使用纯粹的抽象 C++显式接口类与真正的服务调用透明性是矛盾的，因为非 C++系统中的服务客户机需要备用的接口定义。

The use of pure abstract C++ explicit interface classes worked against true service invocation transparency, because service clients on non-C++ systems required alternative interface definitions.

youdao

使用纯粹的抽象 C++显式接口类与真正的服务调用透明性是矛盾的，因为非 C++系统中的服务客户机需要备用的接口定义。

The use of pure abstract C++ explicit interface classes worked against true service invocation transparency, because service clients on non-C++ systems required alternative interface definitions.

youdao