black hole
柯林斯词典
1. N-COUNT 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
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1. N-COUNT 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