The findings confirm an earlier observation by a team of astronomers, making a strong case that the Milky Way has two major spiral arms, a common structure for galaxies with bars.
此发现证实了一个天文学家小组先前获得的观察：银河系有两条主要的螺旋臂，是一个普通中心带有横条的星系结构。
The concrete structure surrounding spiral case of the Three Gorges power station's powerhouse becomes one of the most complicated structures of the powerhouse for its queer geometric figuration.
三峡电站厂房蜗壳外围混凝土结构由于其几何形态的奇异而成为三峡电站厂房结构中最复杂的结构之一。
Longtan hydropower station is large in big structure size of spiral case, high in installation accuracy and welding requirement, poor in welding environment, and short in construction period.
龙滩水电站机组蜗壳结构尺寸大，安装精度和焊接要求高，焊接环境差，工期要求短。
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