Earth's shadow has two main regions: the outer shadow, called the penumbra, and the inner shadow, known as the umbra. The penumbra causes faint dimming that can be hard to notice. But the umbra is much darker. As it sweeps over the moon, the eclipse becomes obvious and the darkened portion spreads until the entire moon is covered.
Yeah, it’s always a little awkward to be able to tell whether something’s a standard library module or not.
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Featured reviews，这一点在雷电模拟器官方版本下载中也有详细论述
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