将触屏键盘一分为二成左右手键盘以使拇指输入更便捷已经是老生常谈了。

Divvying up an onscreen keyboard into left - and -righthand sides to make for easier thumb-typing is a very old idea.

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和其他单手使用的键盘不同，二分之一键盘完全建立在QWERTY输入系统上，所以你不用再学习一种新的打字方法。

Unlike other one-hand keyboards, this one is based fully on the QWERTY system so you don't have to learn a new method of typing.

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应用程序通常在界面控制方面比较滞后，由于API十分有限，应用程序的功能被局限于键盘和鼠标事件。

Applications frequently lag behind in their interfaces for control, restricting their functionality to keyboard and mouse events through a lack of APIs.

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So in a moment you're going to go ahead and hit the spacebar and then as things fall from the screen when they line up with the left arrow, hit the left arrow with a different arrow, hit that arrow and see how good a score you can get.

一会儿你走到前面，敲一下空格键,当屏幕上面的东西从左边往下掉的时候,你就敲一下键盘上的左键,是哪个方向，敲对应的方向键就可以了,我们来看看你能得多少分。

哈佛公开课 - 计算机科学课程节选