Sing Yin Secondary School
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serve_a_ball_1_avi.swf
下手發球-片段二
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左手將球輕輕拋起在身前右側 。右臂伸直，向後擺動。
右腳蹬地力量，身體重心移至前腳上,右手向前擺動擊球。
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