创建的各种工件都是用例建模的一部分，为测试组织提供了有价值的必需的信息，这些信息在开发测试用例中被利用到。
The various artifacts created as part of the use case modeling process provide valuable and needed information to the test organizations, which can be utilized in developing test cases.
当为下面的测试步骤构建测试用例时，测试人员需要从其它工件中拉取。
Testers will need to pull from other artifacts when building tests cases for the following types of tests.
以车削正四棱柱为例，进行了误差分析，得到了刀具长度与工件尺寸和容许误差间的关系。
Then by taking the regular square prism as an example, the machining error is analyzed, and the relationship among the length of the lathe tool, the work dimension and the tolerance is obtained.
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