I see a 10-meter drop into a pool and I think I'm going to die.
我站上10米跳台往下看的时候，脑子里只有一句话，这下死定了。
Not my thing. Divers they see a 10-meter drop and think,
而与我不同，当跳水运动员站在10米跳台上的时候，只会想一件事，
"How can I bend physics to make this awesome?" Divers are spinning and flipping and twisting water ninjas that have bent the laws of physics to their whim with nary a splash.
“我要如何利用物理规律，让入水过程看上去很漂亮?”跳水运动员是熟练掌握旋转、翻转、弯曲技能的水忍者，他们随心所欲地利用物理定律做出高难度跳水动作，却只溅起很小的水花。
How do they do it?
他们怎么做到的?
Well Let's take it from the top.
让我为你们从头捋一捋。
Be it from a springboard 3 meters up or a solid platform a dizzying 10 meters up, the initial leap is all-important.
无论是在3米跳板上，还是在令人晕眩的10米高的固定跳台上，起跳都是至关重要的。
First off when the diver jumps they have to make sure they're not going to end up where they started; on a concrete platform 3 stories into the air and decidedly dry.
当跳水运动员起跳的时候，必须确保自己不会落在原地，就是那个三层楼高并且绝对坚硬扎实的平台。
Failing to clear the platform or board is a big no-no, so the diver has to give themselves some forward velocity, meaning that they will travel in an arc until they hit the water.
不跳出跳台或者跳板是绝对不行的，所以运动员必须向前跃出，这意味着他们在入水前会在空中划出一道弧线。
The diver also wants to get as high as possible, because more time in the air means more tricks that they can pull off on the way down.
跳水运动员希望跳得越高越好，因为在空中停留的时间越长，他们就能在下降的时候展现更难的技巧。
The final dimension determined at takeoff is a diver's rotation.
起跳决定跳水动作的最后一个因素是运动员的身体旋转。
If they're going to spin and flip, they need to start that from the jump.
如果他们要旋转和翻转，那从起跳时就要开始做动作。
But they can increase the speed they're spinning as they fall by drawing their body into a compact ball.
但他们可以通过将身体紧紧团成球状来提高下落时的旋转速度。
This tuck position reduces what's called their "moment of inertia," the body's tendency to resist angular acceleration.
这种团身姿势减少了所谓的“惯性矩”，也就是身体对抗角加速度的倾向。
When the moment of inertia goes down, their rotational speed goes up to conserve their rotational momentum, more commonly known as angular momentum.
惯性矩降低时，他们的旋转速度会提高以保持它们的旋转动量，也就是通常所说的角动量。
The result is divers can squeeze four and a half flips into a second and a half of fall time.
结果就是运动员可以在一秒半的下落时间内完成四周半的转体。
The other commonly used position for increasing spin speed is called the pike, but unlike the tuck the legs are kept straight, meaning the diver has less control over their rotational speed, and the dives have a much higher difficulty.
另一种常用的提高旋转速度的姿势叫做屈体，但与団身不同的是，屈体要让腿保持伸直，这意味着运动员对旋转速度的控制更少，动作难度更高。
Diver's have to spot the water to know when they'll splash down, no easy feat when they're twisting and rotating and traveling at 51 kilometers per hour after falling 10 meters.
跳水运动员必须看到水面才能知道自己什么时候会入水，这可不是件容易的事，因为他们从10米高的地方跳下后，还要以51公里的时速转体和旋转。
When it's time to get wet, the diver's goal is to enter the water with as little splash as possible.
入水时，运动员的目标是溅起尽可能小的水花。
If they do it right, they'll part the water with a sound like ripping paper, known as a rip entry.
如果动作到位，入水时的声音就像纸被撕开一样，这称为压水花技术。
To achieve this the diver has to punch a hole in the water and enter it as straight as possible.
为了达到这个目的，运动员必须先在水面打开一个口子，然后尽可能身体笔直地进入水中。
Remember though that because angular momentum is conserved, they're still spinning when they straighten out, just more slowly.
但要记住，因为角动量是守恒的，运动员身体伸直时仍然在旋转，只是速度更慢。
Their body still rotates underwater, but masterful divers will hit the surface in such a way that they look like they're going straight in.
他们的身体在水下还会继续旋转，但高水平运动员能以一种看起来就像是笔直扎入水中的方式触水。
If they can pull off the rip entry after flipping out more than teenagers' mom, they stand a chance of making a splash at the summer games.
如果他们能超水平发挥成功地压住水花，就有机会在夏季奥运会上大放异彩。
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