Look from dimension, cylindrical the length of cistern is 81 centimeters, and general closestool is flat look cistern, length has 72 centimeters only, differ 9 centimeters.

• 从尺寸上看，圆柱形水箱的长度为81厘米，而一般的马桶都是扁形水箱，长度只有72厘米，相差9厘米。