at多表目的或目标，而to 则仅表方向。如：
① He threw the ball at me. 他对准我扔球。
② He threw the ball to me. 他朝着我这个方向扔球。
③ My father shouted at me.我父亲对我吼叫。
④ My father shouted to me. 我父亲朝着我喊叫。
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