当行动不便者正用声音指挥轮椅经过障碍物或危险地形(如楼梯)附近时，这一功能显得尤其重要。

This is especially important if, say, a person with limited physical mobility is using voice commands to guide his or her chair near obstacles or dangerous terrain (like a stairwell).

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如，教室、办公室必须是坐轮椅和支拐杖的人士能够进入的场所，所以大多数教室、办公室有适于这一用途的特别的匝道和电梯。

For example, classrooms and offices must be accessible to people with wheelchairs or crutches, so most of them have special ramps and elevators for this purpose.

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