The result shows that with the same AS pressure and airflow rate, the greater the AS well depth, the greater the radius of influence(ROI), but the air distribution concen.

实验结果表明：在相同曝气压力和流量下，曝气深度越大，影响半径越大，但影响区内的气流分布越稀疏；相反，曝气深度越小，则曝气影响半径越小，但在影响区内空气流线分布越密。

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The report shows that Bing had a better ROI than Google, up 10% compared with a year ago, while Google was down 12% from a year ago.

FORBES: Google Beats Bing in Q1, Game Not Over - Facebook!