叶轮转动一周，会在转到某一角度时，局部出现口环径向间隙的最大间隙或最小间隙。
Rotating impeller week, will go to a certain point of view, the local emergence of Sandy Bay's largest radial clearance or minimum clearance space.
围绕套管的四周360度的环型空间允许水泥完全能够密封套管与井壁。
A continuous 360-degree annular space around casing allows cement to completely seal the casing to the borehole wall.
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