The moon disk blocks almost all the light from the sun.

月亮的圆盘几乎挡住了太阳的所有光线。

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That moon would have interacted with a disk of gas surrounding Saturn at the time, dragging its orbit closer and closer.

这颗卫星在那时可能与土星外的气态光环发生了作用，造成它的轨道越来越靠近土星。

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Partial solar eclipses happen when the moon blocks only part of the sun's disk, as seen from Earth, casting regions of the planet in shadow.

当月亮遮住部分太阳时，日偏食发生了，就像从地球上看到的一样，使得地球上的部分地区笼罩在阴影中。

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During his 32nd solar eclipse observation, the Harvard-trained astronomer is to study the elusive coronal ring, the outer atmosphere of the sun, which can only be seen when the moon blots out the solar disk.

CNN: Africa awaits total eclipse of the sun

People in a much larger region of the world can anticipate seeing a partial solar eclipse, in which the moon blocks only a fraction of the sun's disk.

CNN: Africa awaits total eclipse of the sun