成为网球高手需要大量的练习；不在球场上花大量时间练习就很难改进挥拍的技术动作。
Expertise in tennis requires lots of practice; it's hard to improve your swing without spending a lot of time on the court.
长而快的挥拍会带来有控制的威力和极其精确的落点。
A long fast swing results in lots of controllable power and pinpoint accuracy.
热身时，专注于轻松的挥拍并注意看球，尤其是从球着地到击球点。
During the warm up, focus on swinging relaxed and watching the ball, especially after it bounces and all the way to the contact point.
两人开始上长达一小时的课，像往常一样，先要进行几分钟的挥拍热身，先正手再反手。
The two began their one-hour lesson, as usual, with a few minutes of long warm-up rallies, first to the forehand, then to the backhand.
随挥：随挥是一个长距离持续性的挥拍动作，一直挥到拍柄底部对着你的左眼为止(对右手持拍选手而言)。
Follow through: the follow through is a long, continuous sweeping motion finishing high with the racket butt opposite the left eye, (for right handers).
结果发现，挥拍速度与球的飞出距离两变量间存在强相关关系。
The results showed that there was close relation between the two variables of swing speed and the bounce distance of the ball.
因此第一：记得在向前挥拍之前让网拍降下(在接触点下面至少一呎)。
So number one: remember to let the racquet fall (at least one foot below the contact point) before swinging forward.
分析两种不同网球底线击球技术的握拍法、步法和引拍挥拍的运动轨迹，比较它们的技术特点及其生物力学特征。
Analyze the racket grasp style, footwork, and the course of lead and brandish of the two baseline drives respectively, and compare the techniques and bio-mechanical characteristics between.
记得，如果网拍面在背后拉拍的低点是关闭的，它在接触点应该是垂直的，假设你是固定前臂和手腕地从肩膀挥拍。
Remember, if the racquet face is closed at the low point of the backswing, it should be vertical at contact, provided you swing from the shoulder with a fixed forearm and wrist.
闪身正手，记住快速后退并保持拍头高举，一旦移动到位，全力挥出，送球一程。
To hit the runaround forehand, remember to backpedal quickly and keep your racquet up high as you move into position. Once there, be sure to swing out and give the ball a ride.
三种相位下的涡流场形态各有不同，上挥（下拍）初期前缘涡的运动主要存在两种形态。
The flow fields are different for the three phase motion patterns and there are two types of leading-edge vortex motion at an earlier stage of upstroke or downstroke.
三种相位下的涡流场形态各有不同，上挥（下拍）初期前缘涡的运动主要存在两种形态。
The flow fields are different for the three phase motion patterns and there are two types of leading-edge vortex motion at an earlier stage of upstroke or downstroke.
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