第四章总结了常用的软件测试技术：黑盒测试技术和白盒测试技术。
Chapter four summarizes the common technologies of software testing: black box testing and white box testing.
其中核心区为东接白岩，西靠火车站，南连章鲁大坝，北抵恩荣堡村，面积约10平方公里。
The central region with an area of 10km2 connects with Baiyan in the east, the railway station in the west, Zhanglu Dam in the south and Enrongbao Village in the north.
第一章，介绍了蒙古族白纛渊源及形状。
In first chapter, the author introduces the origin and the shape of Mongolian Chagaan Suld.
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