| 摘要 |
The disclosed method includes the steps positioning a first plurality of ball bearings around a spindle; enveloping the first plurality of ball bearings and the spindle with a bladder; and injecting a viscous substance into the bladder. The disclosed system includes a plurality of ball bearings; a bladder for enveloping the plurality of ball bearings; and an interface for connecting the bladder to a virtual reality means.
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