That's how long it takes the umbra to move over one spot on the Earth.

这就是本影扫过地球上某一点所需要的时间。

A partial eclipse is when the moon only gets covered by part of the Earth's umbra.

月偏食是指月球只被部分地球本影遮住的情况。

Here's the penumbra, a partially shaded outer region surrounding the umbra, a fully shaded inner part that's darkened.

这是半影区，一个包围了本影区的外部区域，本影区是一个完全黑暗的内部区域。

Instead, its umbra moves across the Earth.

相反，它的本影在地球上移动。

People in the path of the umbra may see a total solar eclipse.

在本影路径上的人们可能会看到日全食。

When the umbra touches the Earth, we get a total solar eclipse.

当本影接触地球时，我们会看到日全食。

Then, finally, the Moon's black disk completely covers the Sun — the umbra sweeps over your location.

最后，当本影扫过你所在的位置时，黑暗的月球完全遮住了太阳。

The narrow shadow in the middle, where Earth is totally blocks the sun’s light, is called the umbra.

中间较狭窄的阴影内，地球完全遮挡住了太阳光，这一部分阴影成为本影。

As the Moon passes into the central part of the Earth's shadow, called the umbra, it darkens dramatically.

当月球进入地球阴影的中心部分，即本影时，它会急剧变暗。

The umbra is gone, but you're still in the penumbral shadow.

本影已经移开，但你仍处在半影中。