@LongDesertTrain OK, next theory: US is very large and the area(s) that happen to have more BA.5.2 also happen to not to be growing much overall right now. When added it depresses the BA.5.2 growth rate. (Our old friend Simpson's Paradox.)
@LongDesertTrain 好的，下一个理论：美国非常大，碰巧拥有更多 BA.5.2 的地区现在也碰巧总体上没有太大增长。添加后会降低 BA.5.2 的增长率。 （我们的老朋友辛普森悖论。）