Spring-loaded annular disc lift 弹簧载荷环形阀瓣升降式止回阀
rotating annular disc 空心旋转圆盘
disc-type annular combustor 盘式环形燃烧室
disc type annular combustor 盘式环形燃烧室
An annular eclipse occurs when the moon does not cover the entire disc of the sun so that a ring of light encircles the shadow of the moon.
当月亮不能完全遮住太阳时，月亮影子的周围就会有一圈亮光，日环食就发生了。
The plate was loaded in its own plane by a pin passing through the hole in an annular disc fitted in the hole in the plate .
平板的孔里面镶嵌著一个套环，在此圆盘的孔中穿过一个销钉而使平板在其自身平面内受载。
The plate was loaded in its own plane by a pin passing through the hole in an annular disc fitted in the hole in the plate.
平板的孔里面镶嵌著一个套环，在此圆盘的孔中穿过一个销钉而使平板在其自身平面内受载。
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