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来源:雅诚德英语网
We have a parabola going downwards in one direction, and upwards in the other one.
我们得到一条在一个方向上向下,而在另一个方向上向上的抛物线。
We have a parabola going downwards in one direction, and upwards in the other one.
我们得到一条在一个方向上向下,而在另一个方向上向上的抛物线。