... barrel-shaped chair 半圆形安乐椅 barrel-shaped spring 中凸形螺旋弹簧 barrel-shaped spring 鼓形弹簧 ...
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Barrel shaped helical spring
... 截锥螺旋弹簧 Conical helical spring 中凸形螺旋弹簧 Barrel shaped helical spring 中凹形螺旋弹簧 Hourglass shaped helical spring ...
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