| 摘要 |
The appts. comprises a string (20) which is threaded through a number of balls to form an endless loop. Thr loop has a dia. which is double or more than double the dia. of a human body. The string is elastic and its ends are fastened to one another. The profile is formed by the balls (10). The string is threaded through holes (11) in the balls. The appts. also comprises spacers (30) which are positioned between the balls.
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