elasticbackpull
... 脑炎后张力障碍 postencephaliticdystonia 弹性后张力 elasticbackpull 制动架，后张力设备，后张力架 Bremsgerüst ...
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其弹性球丸内充满液体，由于液体的相对不可压缩性和表面张力的作用，可促使弹性球丸受力变形后的迅速恢复。
The elastic ball is fully filled with liquid. When the said elastic ball is forced to deform, it can be quickly restored as the liquid has the relative incompressibility and surface tension.
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