With use case-driven development, each test level USES a different grouping of artifacts, which AIDS in keeping the test within the appropriate boundaries for the phase.
有了用例驱动开发，每个测试水平使用工件的不同分组，从而有助于使测试保持在这个阶段适当的范围内。
The wide development strata overlap belt of different period and different level provided passage for petroleum migration, created beneficial reservoir conditions for strata reservoir formation.
不同时期、不同级别的地层超覆带的广泛发育为油气运移提供了通道，也为地层油气藏的形成创造了有利的圈闭条件。
Inspected from the center city space level, between the different districts, both the new community development and the old community transformation have serious problem of space polarization.
从中心城区空间层次来看，不同区之间在新住区开发和旧住区改造两方面也存在着较为严重的空间极化问题。
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