It hinges on information flowing in two directions, both from the diagram to your eye, but also back from your brain through the mouse pointer to the live diagram.

它取决于两个方向流入的信息，既从图表进入您的眼睛，也通过鼠标指针从您的大脑到达实况图。

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So far the examples have picked objects using the default shape: an imaginary ray going from the viewer's eye position through the mouse pointer into infinity.

目前为止的例子都是使用缺省形状拣选对象：可以假想是一根从观察者眼睛的位置经过鼠标点至无穷远处的射线。

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The lion opened one eye and saw the little mouse.

狮子睁开了一只眼睛，然后看见了这只小老鼠。

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Similarly, a mouse which had its own gene controlling development of the eye replaced by the homologous fly gene developed a normal mouse eye.

ECONOMIST: Genetic science

However, while he can see its popularity for disabled or elderly people, Faisal remains uncertain about whether cheap eye-tracking devices are ready to take over from the mouse and touch-screen computers.

CNN: $30 gadget lets you control computer with your eyes