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D B B 12 题, 如果第一段的最后一句是: A few skeptics have argued that the concentration of mass necessary to explain the speed of the (20)whirling gas is not necessarily a black hole: the concentration in M87 mightbe a cluster of a billion or so dim stars. 问那个undermine。 B说A cluster of stars at the center would preclude the existence of certain other astronomical phenomena that have been observed at the center of M87. 说那个解释会直接排除其他在M87中心观测的到的现象。 就是说其他观测的到的现象和那个解释矛盾。 直接undermine |