@beef6464 @JuliaRaifman It doesn't have to be "greater". Spread is the sum of all places where spread occurs, not the maximum or average. A community with spread outside schools which then adds a somewhat lesser total quantity of spread inside schools has more total spread, not less.
@beef6464@JuliaRaifman它不必“更伟大”。价差是发生价差的所有地方的总和，而不是最大值或平均值。一个在学校外传播的社区，如果在学校内传播的总数量稍小，那么它的总传播量就更大，而不是更少。