| 摘要 |
A softball which includes a spherical core, a vapor block made of yarns which imbeds the spherical core and then is immersed into an adhesive agent to fill up clearances between the yams, and a cover made of two sheets of flexible material stitched together to enclose the vapor block, whereby even if the softball is stored in a humid environment or comes into contact with water when playing, no water or moisture can pass through the separation layer to the spherical core thereby extending the service life of the softball.
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