控件是用户同程序交互的可见单元。
Controls are the visual elements that let the user interact with the application.
对包含该书的表格单元使用可见文本选项来记录数据验证点。
Record a data verification point using the Visible Text option for the table cell containing the book.
单元测试强调内部结构，例如逻辑和数据流，以及单元的功能和外部可见行为测试。
Unit testing addresses the internal structure, such as logic and dataflow, and the testing of functions and the externally visible behavior of the unit.
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