But independent reports said a stubborn gray haze shrouded Beijing throughout the test period.

但是独立报导则说,实验期间北京仍然笼罩在挥之不去的灰雾之中.

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Such procedure is helpful for improving the test quality and shortening the test period.

该规范有助于提高检测质量和缩短检测周期.

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The technology can shorten testing and production test period, and reduce production cost.

该工艺对缩短测试、试油周期, 降低生产成本起到了积极作用.

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