But do not fit yourself into a rigid mold that says you must hit the ball waist high or else you are not playing good tennis 不过，把自己放入“必须击打腰部高度的球”这一硬性的模型中就不明智了，或者说你没有学好网球。
3.
Though grass grew waist high on the top , the wall was in great shape and we trekked atop it , my father marveling at both the construction and the solitude 尽管顶部的草已经长到半人多高，但是墙体保存得十分完好。我们跑到长城顶上，我父亲不禁对城墙的建筑及此地的偏僻感慨不已。
4.
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 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?那仍然会是安全的。
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