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。
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.
在一次日食中，月亮的影子使地球的一部分黑下来。
Themoon's shadow darkens part of Earth during a solar eclipse.
在这个过程中，地球的影子会缓慢飘过月亮。
During this period, the shadow of the Earth will slowly drift across the moon.
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