另一种可能，称为扩展现实，能在你直接感受到的周围环境覆盖模拟要素。

Another possibility, known as augmented reality, is to have your perception of your immediate surroundings partially overlaid with simulated elements.

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头盔显示器(HMD)定位是扩展现实系统应用中必不可少的关键过程，其定位的准确程度直接决定了三维注册的精度。

The location of head mounted display (HMD) is the essential crucial process of augmented reality system, it's veracity determines the precision of three dimension registration.

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