Round steel tube is a main structure form, and it has been widely used in space structures such as shell structures.
圆钢管作为一种主要杆件形式，被广泛应用于网壳等空间结构中。
To construct high grade road in the mountainous area will meet the high filled embankment inevitably, the high filled embankment has become one main structure form of the roadbed.
在山区修建高等级公路，不可避免会遇到大量的高填路堤，高填路堤已成为路基的主要结构型式之一。
The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.
结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。
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