答：威浮球(Wiffle)是近年在美国流行的空心塑胶球，因为不规则的空洞造成球路轨迹变化，可以拿来当作变化球的训练。
基于16个网页-相关网页
Wiffle ball 威浮球
Wiffle Ball Advance 高级威孚棒球
Wiffle Ball Advanc 高级威孚棒球
The Birth of Wiffle 洞洞球的诞生
The grand prize winner among graduate students was Inanc Ortac, of the University of California, San Diego, for what he calls Nano-Wiffle-Balls for Cancer Therapy.
FORBES: The Greatest Young Inventors in America
Unless, of course, you believe the only thing that will stop a bad guy with a billiards cue is a good guy with a Wiffle ball bat.
CNN: Is TSA serious about letting people carry knives?
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