1.Pascal To help his father, use gear theory, invented the first calculator can perform addition and subtraction operations.
帕斯卡为了协助父亲，利用齿轮原理，发明了第一台可以执行加减运算计算器。
2.The main method is to use gear transmission equation of no flank gear clearance, and the method is feasible after putting it into practice.
应用无侧隙啮合传动方程式，阐述改磨插齿刀的原理和计算方法，并通过实例加以说明。
3.Rotary sprayers use gear driven or impact hammer mechanisms to rotate the spray head in a circle.
使用旋转式喷雾器齿轮驱动或影响锤机制，旋转一圈的喷头。
4.Therefore, we must use gear-board pumpingcore institutions, using hydraulic cylinder to promote gear-board and extrude the core.
因此采用齿轮板抽芯机构，用液压缸带动齿条推动齿轮板抽出型芯。