你说第一张图吧?那是发球

来源: hurr 于 2013-04-03 14:17:56 [] [旧帖] [给我悄悄话] 阅读数 : (198 bytes)

it's about Kick serve vs regular serve. I assume you know what a kick serve is.

Full artical here:

http://twu.tennis-warehouse.com/learning_center/kickserve.php

 

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