This paper gives a brief introduction to the cardinal principle of horizontal directional drilling technique and its application in the construction of sewer net.
本文介绍了水平定向钻进技术的基本原理及在污水管网建设中的应用。
Temperature stress and temperature control possess the important meaning in the cardinal principle is amassed the concrete, and this chiefly is the reason owing to two aspects.
在大体积混凝土中，温度应力及温度控制具有重要意义，这主要是由于两方面的原因。
The cardinal rule in science is that all claims must be testable -- they must be capable, at least in principle, of being proved wrong.
科学中一条主要的原则就是所有的断言都必须是可检验的——它们必须至少在原则上都能够被证明是正确或错误的。
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