The wheelchair tennis player is allowed two bounces of the ball.
残疾网球运动员可以有两次弹球的机会。
The golden rule in tennis is to keep your eye on the ball.
打好网球的重要原则是眼要紧盯着球。
In tennis you must hit the ball before its second bounce.
打网球时，在球第二次弹起之前你必须击中它。
He spent hours throwing a tennis ball against a wall.
他花了数小时对着一堵墙扔网球。
My father would burst into the kitchen bouncing a tennis ball.
我父亲会拍打着网球闯进厨房。
I spent many hours mindlessly banging a tennis ball against the wall.
我花了好多个小时单调地对着墙打网球。
我这里有个网球。
这是一个乒乓球。
This tennis ball has no more bounce.
这个网球已经没有弹力了。
There is air drag on that tennis ball.
网球受到空气阻力。
I have also here a regular... well, it's not quite a tennis ball, but close enough.
这里有个规则的。，它接近于网球。
Suppose I take a tennis ball 100 and I throw up a tennis ball in 26.100.
比如，我拿了个网球,把它向上抛26。
It's actually an advanced piece of robotics that won't fetch a tennis ball.
虽然它确实不会叼回抛出去的网球，但它可是一只先进的机器狗。
It means this tennis ball... while it is in free fall, it has no weight.
再比如说这个网球。，自由落体过程中它没有重量。
The largest is the size of a tennis ball.
最大一块有一个网球那么大。
So, try to see that the tennis ball is very close to an ideal parabola.
所以，试着看，网球是一个，比较理想的抛物线。
All the kinetic energy is in the tennis ball; nothing is in the wall.
也就是网球的动能，墙壁没有动能。
So, look at the tennis ball first.
首先，看网球。
We have here a trajectory of a golf ball or a tennis ball in 26.100.
假设这是一条属于教室里,某高尔夫球或网球的运行轨迹。
Put a tennis ball between your shoulder blades and try to squeeze the ball.
还将一个网球放在肩胛骨处，然后学员得努力地挤压那个球。
The other tennis players will return the tennis ball with their rightly power.
另一个网球运动员会正确地使用他们的力量，让球返回去。
"Tennis ball," came the breathless reply.
“网球，”慢跑者气喘吁吁地回答道。
We discuss throwing a football, hitting a baseball or tennis ball, kicking a soccer ball.
我们讨论投掷足球，棒球或触及网球，踢足球。
A tennis ball struck Tom on the face.
一颗网球打在汤姆脸上。
He hit the tennis ball over the net.
他把网球打过了网。
He hit the tennis ball over the net.
他把网球打过了网。
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