You know, 10 years ago, or 15 years ago, really, you walk into an astronomy convention, and you say, "You know, there's probably a black hole at the center of every galaxy," and they're going to hoot you off the stage.
10年前——亦或15年前， 当你在天文学大会上发言， 说，“你知道，很有可能每个银河系的中心都有个黑洞。” 那你就会被人轰下台。