The results show that the improvement of the slant improved oil-well pump 's internal structure and the optimization of the materials are the main factors to improve pump efficiency.
研究结果表明改进型斜井泵的内部结构的改进和材质的优选是泵效提高的主要因素。
Today, the space station?s exterior structure is as long as an American football field and it has about the same internal living space as a Boeing 747 jumbo jet.
今天空间站的外面结构长度约有一个美式足球场一般长，而内部的生活空间约像一架波音七四七珍宝客机般大。
But in 2008, the firm found that the 787's carbon-fibre "wingbox", the internal fuselage structure the wings attach to, was not strong enough and needed stiffening with metal spars.
但是在2008年，公司发现内部机身结构与机翼结合处的787的碳素纤维“翼盒”，强度不够并且需要金属翼梁的加固。
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