以下为句子列表：
英文: Also, use the non-hitting hand to help get the racquet down below the contact point before swinging forward.
中文: 同时,使用非打击的手帮助网拍在向前挥拍之前能降低到低于接触点。
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英文: And remember, if the racquet does not drop down at least one foot below the contact point before swinging forward, your shot is probably going into the net.
中文: 而且要记得，如果网拍在向前挥拍之前，不能降低下来至少低于接触点以下一呎,可能你正在击球挂网。
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英文: Are service integrators of 2PL and 3PL, serving a single contact point for the 1PL. They provide end-to-end solutions to ensure high value-added supply chain services to the 1PL.
中文: 第二、第三方物流的综合体，为第一方物流企业提供个性化服务，为其量身定做整套物流操作方案，从而确保这种具有高附加值的供应链服务的质量。
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英文: If the contact point was chest high or shoulder high, the racquet could be up around waist high at this point, which would still be safely one foot lower than the contact point before swinging forward.
中文: 如果接触点是在胸部高度或者肩膀高度，网拍可能此时向上到腰部高度周围这一点，在挥拍之前比接触点低一呎那仍然会是安全的。
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英文: The question of ultra-sonic inspection on weld defect detecting of net frame spherical shape contact point is introduced in this paper, the detected rate of weld defect of net frame spherical shape contact point was significantly increased by improving th
中文: 摘要介绍了超声波探伤技术在检测网架球接点焊缝缺陷中存在的问题；通过对超声波探头、灵敏度专用标准当量试块和参考试块以及超声波探伤工艺等的改进，提高了球接点网架焊缝缺陷的检出率。
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