骨头上也有敲击的痕迹，是露西的朋友们为了获取骨髓而敲碎骨头时留下来的。

The bones also had percussion marks, sustained while Lucy's friends smashed the bones to get at the marrow.

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这个敲击的动作就可以解释为什么钢琴是打击乐器而不是弦乐器。

This striking action is why the piano is a percussion instrument instead of a string instrument.

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“我敲击的角度将会对结果产生重大影响，”他说。

"The Angle at which I strike this will have a major effect on the result," he says.

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Tests show in the nineteenth century that people could type four or five times as fast as they could handwrite and there's no ambiguity because it's very clear what key was struck; whereas, handwritten--fast handwriting becomes impossible to read--or difficult.

通过测试显示，在19世纪,人们打字的速度是手写的4至5倍,而且也不存在字迹模糊的问题,因为键盘敲击出来的非常清晰;,而手写，尤其是快速手写根本无法阅读,或者说是很难阅读。

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And if you are looking at a keyboard, we can predict in the real time very rapidly that beat your very single finger typing speed, exactly the letters you like to type and hit, therefore provide a communication mechanism that Christopher Reeve and those similar with him can benefit from.

如果你在看电脑键盘，你可以十分快速地,实时预知自己手指敲击键盘的速度，预知你想录入的字母，这样便为克里斯托弗·里夫,和其他你说熟悉的人提供了一种沟通机制，使他们从中受益。

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So what would be the letter A in binary inside of a computer's memory when you hit the letter A on the keyboard, for capital A?

当你敲击键盘上的字母A时,那么在计算机二进制的存储中,字母A是什么样的呢？

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