认识到头部控制是非常重要的。

Understanding head control is important.

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病人坐在一张类似于牙医椅子的装置上，这把椅子有个斜靠的椅背以及填充的头枕，同时还有一个触屏式的控制面板以及一个可以精确的和患者的头部吻合的电磁圈。

The chair reclines and has a padded headrest. It also has a touch-screen control panel and an electrical magnetic coil that is positioned on a precise spot on the patient's head.

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我们现在先不涉及版本控制的细节(将在稍后讨论)，先来看看这两个头部的作用。

Without getting into the details of versioning (which will be discussed later) let's consider what these two headers are doing.

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