Ceramic tile: use a small hammer knock on to see if free drum sound, groove seam is full, ceramic tile stick whether level off.
瓷砖：用小锤子敲敲看是否有空鼓的声音，沟缝是否饱满，瓷砖贴的是否平整。
Two groove of the inner ring and outer ring groove for the ball between the form of a drum, equipped with roller bearings.
二条滚道的内圈和滚道为球面的外圈之间，装配有鼓形滚子的轴承。
The hoop cable, the welding joint and the groove of the drum body keep on a plane.
箍索及焊接连接点与鼓身的凹槽保持一个平面。
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