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black hole
Word forms: plural black holes
1 N-COUNT 黑洞 Black holes are areas in space, where gravity is so strong that nothing, not even light, can escape from them. Black holes are thought to be formed by collapsed stars. 黑洞
2 N-COUNT [usually singular] 无底洞 If you say that something, especially money, has gone into a black hole, you mean that it has disappeared and cannot be recovered. 无底洞
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