这座火山有一个巨大的火山口。
The volcano has a large ___crater.
月球表面布满了陨石坑。
The moon's surface is covered with ___craters.
火山爆发后，山顶形成了一个巨大的坑洞。
After the volcanic eruption, a huge ___crater formed at the top of the mountain.
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