A study on the strength of the trapezoid teeth of synchronous belts .

梯形齿同步带带齿强度的理论研究。

For making fine turning and trapezoid threading turning tools .

制造精车刀和螺纹车刀。

In a fountain colonnade wage-earners rolling dam , the trapezoid flows from here as spring water , therefore the name .

在沁泉廊下有一个梯形的滚水坝，水从这里流过象泉水一样，故此得名。

Note the rupture of the periosteal sleeve and complete rupture of the trapezoid and conoid ligaments .

记录骨膜外壳破裂及斜方和圆锥韧带完全断裂。