因为较长的球拍可以产生较快拍头速度，所以给球的旋转也越强。
The string bed in a longer frame generates more spin due to increased velocity.
通过分析刀刃的螺旋特性，建立了球头旋转锉刀刃及螺旋槽的理想几何模型。
In this paper, based on the analyzes of helical characteristics, ideal geometric models of cutting edges and helical grooves of nose burr are developed.
将焊有球头的管子与外螺纹接头中心相对，旋转螺母使其自动对中心后，敲击螺母使螺母旋紧。
Make the pipes with button head align with the joints of external thread, rotate the nut and make it align to the center, knock the nut and screw up the nut.
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