It is called the centripetal acceleration.
这叫做向心加速度。
But there is nothing to provide that centripetal acceleration.
但这里却没有力，能提供向心加速度。
And that centripetal acceleration D is a must for this object to reach that point D.
这个向心加速度，对这个物体达到点，来说是必须的。
This ball is feeling a pull from the string and that provides it with the centripetal acceleration.
小球受到绳子的拉力，这就是向心加速度的来源。
There is a requirement that there is a centripetal acceleration, which is in this direction, a centripetal.
前提要求就是，具有向心加速度，朝这个方向，向心力的作用。
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