| 摘要 |
The present invention concerns a bowling ball having an arrangement of holes for allowing a bowler to grip the ball. The arrangement includes a thumbhole having a profile which is shaped to accommodate the thumb of the bowler in a bent position. The thumbhole can be configured to accommodate the thumb of the bowler in a bent position in which the bowler grips the ball, and provides a clearance fit with the thumb of the bowler when in a substantially straight position. The shaped profile of the thumbhole can be provided by a pad for the thumb or be defined by an insert to the thumbhole.
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