The outer barrel of the syringe should be transparent enough; bench line can be seen distinctly.
注射器外套应有足够透明度，能清晰地看到基准线。
Gun barrel is a thick and hollow part which is composed with three characteristic surface: line chamber, chamber, outside surface.
枪管是一种厚壁空心管件，由线膛、弹膛、外表面三部分组成。
Based on this method, the design and construction of barrel vault advanced support in line Fuxingmen to Bawangfen of subway and the heating pipe in Beijing got a perfect result.
按此方法指导的水平管棚设计施工在北京地铁复八线和热力管道工程中取得了良好的效果。
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