This paper discusses the five main activities of software test and their features, pointing out the two test activities best suitable for automation: test execution and test check.

研究了测试的五个活动和它们的特点，指出了最适合于自动化的两个测试活动：测试执行和测试检查。

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Short of getting a human involved to look at the model, there are ways to check that the normals are pointing outwards.

除了让人来分辨这个模型的正误外，还有另外一种方法判断平面的法向量是否朝向外面。

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Check valves MUST be installed with the valves flow arrow pointing in the direction of the flow.

安装止回阀必须使其阀门流向箭头与流体流向相一致。

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