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。
2
An embodiment of a connection system for a grease cover of a constant velocity joint includes a groove portion formed in a generally annular portion of the constant velocity joint.