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。
An annular groove is arranged on an outer circular cylindrical surface of the brake disc.
在刹车盘外环柱面上有环形凹槽。
An annular groove is arranged on an outer circular cylindrical surface of the brake disc.
在刹车盘外环柱面上有环形凹槽。
应用推荐