据此，确定了两种害虫的科学抽样方式和不同密度下的合理抽样数量。
The scientific sampling size and suitable sampling number under different densities on the two pests were consequently determined.
离开之前，科学家们决定通过抽样检测海拔一英里的博尔德市的空气，对在旅程中将会用来检测空气中硝基氯含量的设备进行检验。
Before leaving, the scientists decided to test the equipment they would use to detect airborne nitryl chloride on the cruise by sampling the air in Boulder, a mile above sea level.
医学科学并不是建立在“常识”基础之上的，而是建立在特殊的科学研究之上：为尽可能排除一切混杂变量而在控制范围内随意抽样化验。
Medical science is not foundedon "common sense, " but on uncommon investigation: on randomized, controlled studies that try to rule out as many confoundingvariables as possible.
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