Do black holes do more than devour matter?
银河系中心黑洞吹出的“微风”

The supermassive one at the centre of our galaxy is surprisingly windy — spitting material out as well as taking it in
安贾娜•阿胡贾：位于银河系中心的那颗超大质量黑洞，出人意料地也会“起风”——它不只吸入物质，也会将物质向外喷射。