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。
Last week a tennis ball hit me on the head, but I tried to ignore the pain, believing that it would go away sooner or later.
上周，一个网球击中了我的头，但我试图忽视疼痛，相信痛感迟早会消失的。
Each "pebble" in a pebble-bed gas reactor is a graphite fuel sphere the size of a tennis ball.
在一个球形气体反应堆里的每一个“小球”都是一个网球大小的石墨燃料球。
A fuzzy tennis ball flies faster than a bald one for the same reason, Mr Bottaro explains.
毛茸茸的网球比表面光滑的球飞得快的原因正是这个原理，波塔罗解释说。
Dopamine receptors seem to track possibilities—an arcing tennis ball that may land in or out—and how expected or unexpected they are.
多巴胺受体有着跟踪潜力—网球的弧线球会落在界内还是界外—是怎样期待还是不期待他们的出现。
Filipino Rodolfo Rivera, 65, runs to hit arecycled tennis ball using a homemade wooden racket strapped to his handsduring a game of handball in Manila, Philippines, onSunday, January 23, 2011.
2011年1月23日，菲律宾首都马尼拉，一场手球比赛上，65岁的鲁道夫·里维拉正在用自制的球拍击打皮球。 这个球也是由废弃网球回收而来。
A recent study shows the negative impact that noise can have when one is attempting to predict where a tennis ball will land.
最近的一项研究显示了，当一个人试图预测网球落点的时候，噪音将对其有消极的影响。
There is air drag on that tennis ball.
网球受到空气阻力。
I have here a tennis ball and I can bounce this tennis ball, I can throw it down.
我这里有个网球，要是把它对着地面扔，它会弹起来。
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。
(Think of what would happen if you tried to slow down a skateboard with a tennis ball on it).
试想一下，你用网球使滑板减速是什么效果。
Not completely elastic, but not bad. A tennis ball--not completely elastic, but not bad.
不是完全弹性的，但不坏，一个网球,-不是完全弹性的，但不坏。
Or I see a chartreuse-yellow tennis ball on the lawn, pick it up and throw it.
否则我的目光会落到草坪上的淡黄绿色的网球上，捡起来，扔出去。
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 a chunk of brain matter "roughly equivalent to a tennis ball in size," McAuliffe says.
“这是一大块的脑浆大致相当于一个网球的大小。”麦考利夫说。
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。
For hundreds of years eyewitnesses have reported brief encounters with the golf ball - to tennis ball-size orbs of electricity.
数百年来，目击者已经多次报道过，他们曾短暂相遇了大小约与高尔夫球到乒乓球相似的电魔法球。
The largest is the size of a tennis ball.
最大一块有一个网球那么大。
Procedural memory is your memory for skills, such as how to hit a tennis ball. This doesn't take conscious thought.
程序性记忆是对技能的记录，比如如何打网球，这并不需要意识过程。
I may tell you something about the fun of chasing a tennis ball, or I may tell you something profound about myself or even life in general.
或许你可以从我这里知道追网球的乐趣，可以看透我内心深处，领悟到生命的真谛。
Use pillows to prop yourself on your side, or attach a tennis ball with a rubber band to the back of a T-shirt to keep from turning over on your back.
用枕头支撑着保持侧身躺，或者用橡皮筋在你体恤衫的后面系一个网球来防止你仰面躺着。
If I throw up a hammer, then the center of mass and only the center of mass will just go along a perfect parabola as if it were just a tennis ball.
我若是抛铁锤，那么质量重心，也是唯一的质量重心，会沿完美抛物线运动，就像一颗网球。
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。
He can try his knuckles, the heel of one hand reinforced by pressure from the other hand on top of it, a tennis ball, or a back massager, using direct pressure or a firm circular motion.
他会尝试用指关节，用一只手掌根压在另一只手背上，网球，背部按摩器，采用直压按摩或圆周按摩。
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