Test pilots try to push the envelope.

试飞员尝试挑战极限。

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For instance, a good test assertion is a JUnit test that returns true if and only if the SOAP envelope returned by a Web service is identical to a pre-defined XML document.

例如，一个较好的测试断言为JUnit测试，即当且仅当Web服务返回的SOAP信封与预定义的XML文档完全相同时，返回true。

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If you want to test the service, enter text in the node of the request envelope and click the green arrow button in the toolbar just above the SOAP request text.

如果想测试该服务，则在请求envelope的节点中输入文本，然后单击位于SOAP请求文本上方的工具栏中的绿色箭头按钮。

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Many visioneers champion free markets, less government, fewer regulations and profits for those who test the technological envelope.

CNN: A pioneer in space and on Earth

So far, the company has built a one-eighth-size prototype to test its design, which consists of a carbon-fibre keel, an envelope made from modern composite materials, half-a-dozen engines, a passenger compartment, and a specially lightened crane.

ECONOMIST: Pushing the envelope