Unverified80% confidenceDecision RuleTime unknown
8字型（葫芦形）浮球夹持稳定性优于方块型，内凹弧度贴合大腿内侧不易滑脱，适合长距离划手练习
1
Sources
80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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