磁力悬浮，或者磁悬浮，使这个旋转的球始终保持在同一位置，比循环滚动机器洗得更干净。
Magnetic levitation, or maglev, holds the ball in place while it spins around, getting clothes cleaner than a circular-spinning drum ever could.
把主球放在棕球置点上，试着使其在被击打后沿着发球线滚动。
Place the cue ball on the brown spot and attempt to hit it along the baulk line.
结果18例成功放置双j管行内引流，1例因输尿管上段高度纡曲狭窄置管失败，6例行单纯球囊扩张。
Results Balloon catheter dilatation was performed in 6 cases. DoubleJ ureteral stent was successfully placed in 18 cases, and failure to success in 1 case due to tortuous ureter.
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