一旦推杆速度稳定了，学员们就会开始掌握推杆。
Once speed is consistent, the student will start knocking in putts.
当一个学员面临推杆问题时，他她在两方面可能有问题：推杆线路和推杆速度。
When a student is struggling with putting, there are two things than can be wrong: the line and the speed.
对顶置式气门机构进行了运动学分析，通过平底推杆的运动规律求得气门的升程、速度和加速度，分别给出了精确解和近似解。
In this paper, kinematics of upper air valve unit is analyzed. The displacement, velocity and acceleration of air valve are calculated by accurate and approximate methods.
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