In the unit test stage, it is often required that sentence coverage rate and branch coverage rate all up to 100% in the structure coverage test.

单元测试阶段结构覆盖测试往往要求语句覆盖率和分支覆盖率均达到100%。

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Microbe growth test has shown the rate of microbe coverage on the pieces of rice hull bowl was 100% after 15 days.

稻壳碗碎片置于腐殖土上，15天后微生物在碎片上的覆盖率即达到100%。

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Whereas the formal constraint language serve as an effective complement and help testers understand the system test, and then further improve the test access rate and coverage rate of test-case.

而形式化约束语言可以对此做到有效补充，它可以帮助测试人员充分理解被测系统，进而提高测试用例的获取率以及测试覆盖率。

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