黄色肉芽肿性肾盂肾炎（XGP）的特征是CT示群集的类圆形的低密度区以及环形增强带形成“熊掌征”；
The CT features of Xanthogranulomatous pyelonephritis(XGP)include multiple, rounded, low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.
菌细胞密度、表面接触和生理学信号均可成为群集运动的刺激因素。
Bacterial density, surface contact and physiological signals are stimulating factors of swarming motility.
科学家们通过研究动物的群集行为，如鱼群，来预测人类可能出现的如此高密度的团聚行为。
Scientists study the behavior of animal swarms, such as schools of fish, to predict the way humans might behave in such densely packed groups.
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