... bber sleeve 橡胶护箍 rubber sphere 橡胶球 rubber spring shock sub 橡胶弹簧减震器 ...
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rubber-steel sphere bush 橡胶
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The ball is a hollow aluminum sphere covered with a thick layer of polyurethane rubber.
这个球是空心球体，表面有一层厚厚的聚氨酯橡胶。
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It says that if in this space any closed-curve object, such as a rubber band, can be shrunk to a point, then the space is topologically equivalent to a sphere.
FORBES: Plugging A Math Gap
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