以下为句子列表：
英文: Here's the key point: Once the racquet face is closed at the low point of the backswing you are guaranteed vertical at contact as you swing forward and up.
中文: 重点在这里：一旦网拍面在背后拉拍的低点是关闭的,则可保证当你向前和向上挥拍的时候,球拍在接触点是保持垂直的。
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英文: It appears she's decided to take a backswing that's bigger than usual so she can ready attack the ball.
中文: 而她的动作追求的是深的力量大的回复，因此她可以随时击球。
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英文: Make sure that the palm of the hitting hand is facing down at the low point of the backswing (which is one foot below the contact point), then keep the wrist and forearm steady as you swing low to high from the shoulder.
中文: 确定打击手的手掌正在下面向著后拉挥拍的低点（接触点下面一呎）,然后当你从肩膀由低往高挥拍时,让手腕和前臂保持稳定状态。
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英文: On the other hand, if the racquet is vertical at the low point of the backswing it will tend to be open or tilted back at contact.
中文: 另一方面，如果网拍在它背后拉拍的低点是垂直的,它在接触点将倾向于是开放的或倾向后斜。
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英文: Once the racquet is back at eye level, the racquet can now fall, or loop down, to the low point of the backswing (one foot below the contact point) before swinging forward.
中文: 一旦网拍回到在眼睛高度，网拍现在能落下，或环状下来，在向前挥拍之前,拉到背后拉拍的低点（接触点下面一呎）。
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