US Market Turn Bear Now? Sell or keep stocks? UMS plunged can buy?美股已转熊?手中股砍或留?UMS大跌可买? On February 26, 2021 US Market Turn Bear Now? Sell or keep stocks? UMS plunged can buy?美股已转熊?手中股砍或留?UMS大跌可买? https://www.youtube.com/watch?v=Yn-iel7X-A0