coma
柯林斯词典
1. N-COUNT Someone who is in a coma is in a state of deep unconsciousness. 昏迷
She was in a coma for seven weeks. 她昏迷了七周。
2. N the luminous cloud surrounding the frozen solid nucleus in the head of a comet, formed by vaporization of part of the nucleus when the comet is close to the sun 慧發; 慧星頭部的發光雲[astronomy]
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