| 摘要 |
<p>A practice golf ball (10), which has an outer shell (20) surrounding an inner shell (30). The inner shell (30) forms a core. A volume of the core is filled 40% to 60% with a fluid (50), such as water. An object, such as a spherical element (60) like a ball bearing, can be positioned within the core to coordinate with the fluid (50) to provide particular momentums and/or forces acting upon the practice golf ball (10), for example when hit with a putter.</p> |
