闪亮的回击以光速的一半速度上行传播，由于它的速度太快，在一张图象中不能捕捉到这一过程。

The bright return stroke travels upward at around half the speed of light, and is too fast to capture in more than one image.

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当尝试新的肌肉记忆模式的时候，开始时以一半速度进行，如此可以帮助你更快理解挥拍的情形，然后逐渐地选择速度。

When trying new muscle memory patterns, go at half speed to begin with. Going at half speed helps you figure out the swing much quicker. Then gradually pick up the speed.

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有研究表明，在道路上画上笔直的横杆，可以在开始将司机的平均速度降低一半。

Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half.

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It's a unique piece because what he does is take some very basic patterns and simply repeats them over and over and over again for about fourteen and a half minutes depending upon the tempo that the conductor is taking the music.

这是件独特的作品,因为他仅仅只是把一些基本的样式,简单地重复重复再重复,大概十四分半钟,当然这也取决于,演奏者的演奏速度

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