| 摘要 |
The tennis racquet can be made of wood, provided it has inner insulation with plastics or corresp. material. It has the same weight, size and shape as racquets in customary use, but vibrates much less when hit by or hitting a ball. - The low vibration factor means less vibrations transmitted to the body of a player, and a considerable redn. in deleterious effects on nerves and blood vessels. |
