The torsional strength of the drilling tools can be greatly increased by using the double shoulder tool joint.

双台肩钻具接头可大幅度提高钻具的抗扭强度。

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The result shows that the velocity field changes with the increase of space from shoulder and stir tool and the flow of weld metal from top to bottom and stir zone to rotation zone also weakens.

实验结果表明：随着距轴肩和搅拌针距离的增大，速度场开始减弱，焊缝金属由顶面向底面、由搅拌区向旋转区的流动也随之减弱。

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The new method for machining keyway in holes and the special tool is presented, with which the keyway not only in blind holes but also in shoulder holes can be machined.

介绍了一种加工孔内键槽的新方法和相应的专用工具。不但可用来加工通孔内的键槽，而且还能用来加工盲孔内的键槽或有障碍台肩的孔内键槽等。

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This is the tool that corporations everywhere have been waiting for: a way to stand over the shoulder of every employee, 24 hours a day, and keep track of exactly how much time he or she is really spending on his or her work.

CNN: Is Big Brother coming to your job?