Ball is a sphere with a circularchannel for gate parts, ball rotation with the stem of the valve action to achieve headstock.
球阀原理，球阀是用带有圆形通道的球体作启闭件，球体随阀杆转动实现启闭动作的阀门。
2
Some laws on hydrodynamic flocculation of fine sediments found in the circularchannel test was elaborated at the beginning of the paper.
本文首先阐述由环形水槽试验所得出的细颗粒泥沙动水絮凝的若干规律。
3
A change in height across the courtyard is highlighted by the flow of water along a channel that drops down from the planted level to the cobbled floor and then funnels into a circular pond.