For instance, requirements might change rapidly, which might undermine testability or test cost assumptions.
例如，需求可能迅速地变更，这可能会破坏可测试性或测试成本设想。
Methods: Medical cost was divided into three parts, drug cost, test cost and treatment cost.
方法：将医疗费用分为3项主要组成部分：药费、检查费、治疗费。
The experiments proved that the method could cut test cost, increase test efficiency and accuracy.
实验证明，该方法可降低试验成本，提高实验效率和准确性。
The experiments proved that the method could cut test cost, increase test efficiency and accuracy.
实验证明，该方法可降低试验成本，提高实验效率和准确性。
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