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。
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。
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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