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强劲发球三要素:强势的握杆,扎实的下盘,以及下挥杆转身过程中,落杆瞬间到触击时的变速加速是打出远距离的关键。
Strong serve three elements: a strong grip, a solid under the plate, and the next swing in the process of turning, the instantaneous fall to the striking speed acceleration is the key to playing long-range.