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。
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。
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。
He observed somebody hit a tennis ball and wondered about the paths of projectiles.
他看到别人打网球就会思考网球的行进路线。
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。
The tennis ball-style single stack of balls in a tight-fitting cylinder is the simplest;
网球式的单层包装将圆柱体塞满是最简单的；
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。
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。
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。
(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。
For cooked pasta, imagine the size of a tennis ball to estimate the correct portion size.
对于煮好的意面，想象一下一个网球的大小来估计一下意面的正确份量。
The human brain has decreased by about the size of a tennis ball over the past 30,000 years.
——在过去三万年间，人类大脑的平均体积大小降低了百分之十。
On the fifth day, God created the tennis ball so that the dog might or might not retrieve it.
第五天，上帝造出了网球好让狗自己决定要不要把它叼回来。
Homemaking blogger I'm a Lazy Mom suggests wrapping a tennis ball in aluminium foil as an alternative.
家政博主“我是懒妈妈”建议用包裹了铝箔纸的网球代替。
The wall has an infinitely large mass, but the momentum of this tennis ball 2mv has changed by an amount 2 mv.
墙壁的质量无限大，但是网球的动量,改变了。
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。
Try sewing a tennis ball into the back of your pyjama top. This will certainly stop you from sleeping on your back!
在你的睡衣后背那缝上一个网球，这样你就不会仰着睡啦。
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。
A tennis ball in class like this, then the whole trajectory is... the whole trajectory is in one plane in the vertical plane.
如果我抛出一个网球，这样，那么整个轨。，在一个平面上，一个垂直平面上。
With a tennis ball under your hitting arm, you'll be forced to hold the racquet out in front of you and use proper technique.
夹一个网球在你击球胳膊的腋下，会强迫你保持拍头在你体前并使用更合理的技术。
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。
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。
Your peripheral vision may not be all that good for watching a fast moving table tennis ball onto a relatively small racket head.
你的余光也未必那么好，能看着一些如此快速运动的小乒乓球到达一个相对较小的拍头上。
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。
Here's a simple tip that will help you master this shot: Practice hitting low volleys with a tennis ball placed under your hitting arm.
这里有一个小窍门帮助你掌握这种击球方法：夹一个网球在你击球胳膊的腋下来练习低位截击。
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。
If you have problems balancing the weight of your foot to the pedal, it helps to keep a halved tennis ball right under the accelerator pedal lever.
如果你难以平衡脚上的重量，在油门踏板下放半个网球将对你有所帮助。
You'll need a collar and a four - or six-foot lead to match the size of the dog. Also bring a tennis ball, a plush toy, and liver or chicken treats.
带一个项圈和一根四到六英尺的牵狗绳去选狗，同时也可以带上一个网球、一个玩具和一些狗食。
The harder you throw the tennis ball, the faster it is travelling when it leaves your hand and the higher the ball will go before turning back.
你扔球时，用力越大，球离开你的手后，就飞得越快，飞得越高，然后才落下来。
The harder you throw the tennis ball, the faster it is travelling when it leaves your hand and the higher the ball will go before turning back.
你扔球时，用力越大，球离开你的手后，就飞得越快，飞得越高，然后才落下来。
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