Dad said: This is the dark shadow of the moon on the 'sea', but there is no water.
爸爸又说：这黑影子是月亮上的海，不过里面没有水。
During totality, the Moon tracked through the northern part of the Earth's dark umbral shadow, so the southern half appeared considerably darker than the northern part.
在月全食的过程中，月亮会经过地球本影的北部，因此月亮下半部分会比上半部分暗一些。
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