您必须使用这种异常机制，除非客户机已经了解期望的数据项数量。

You must use this exception mechanism unless the client already knows how many data items to expect.

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除非这项技术已经被证明，否则没有人会使用它。

Until the technology had been demonstrated, she said, no one would use it.

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如果全局变量是在会话内创建，则其他会话不能使用它，除非已经提交了这个工作单元。

If a global variable is created within a session, then it cannot be used by other sessions until the unit of work has committed.

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