一些学者认为，鸟类可能会在自己的视野边缘看到一个点，并根据它们飞行的方向作相应转动。

Some researchers think birds might see a dot at the edge of their vision, swiveling according to the direction they're facing.

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为了要确定你在足够地盘绕，背后拉拍上转动肩膀要足够到让你的对手见到你的球拍进入你背部后面的视野。

To make sure you're coiling adequately, rotate the shoulders on the backswing enough for your opponent to see your racquet come into view behind your back.

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图38在这一张相片中，注意肩已经转动足够到我的对手可以见到我的网拍进入在我的背部后面的视野。

Fig. 38 in this photo notice the shoulders have rotated enough so that my opponent could see my racquet come into view behind my back.

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