The hash code should provide a uniform distribution of values over the key space so that the partitions are evenly balanced.
散列码应该在键空间上提供均匀的值分布，以便分区负载平衡。
If all the forces acting on a particle are balanced, the particle will either remain at rest or will continue to move in a straight line at a uniform velocity.
如果作用在质点上所有的力是平衡的，质点将会保持静止或做做匀速直线运动。
More speedy and more beautiful sewing is promised with well balanced left and right seams and uniform tightness of forward and backward stitches.
缝纫速度更快，缝纫质量更好，缝纫线迹左右对称，倒缝顺缝迹密度均匀。
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