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。
This tennis ball has no more bounce.
这个网球已经没有弹力了。
这是一个乒乓球。
So, look at the tennis ball first.
首先，看网球。
乒乓球的体积？
There is air drag on that tennis ball.
网球受到空气阻力。
The largest is the size of a tennis ball.
最大一块有一个网球那么大。
He hit the tennis ball over the net.
他把网球打过了网。
A tennis ball struck Tom on the face.
一颗网球打在汤姆脸上。
The tennis Ball was hit Back and forth.
网球是空心的，但棒球是实心的。
我有一个网球。
"Tennis ball," came the breathless reply.
“网球，”慢跑者气喘吁吁地回答道。
A tennis ball is hollow, but a base ball is solid.
网球是空心的，但棒球是实心的。
Where is the Beijing Olympiad table tennis ball project held?
北京奥运会乒乓球项目在哪里举行？
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。
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, 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。
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。
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'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。
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