Without gravity, there would be no air or sound of any kind.
如果没有地心引力，就没有空气和任何声音。
Without gravity there will be no air and no sound of any kind.
如果没有重力，就不会有空气和任何声音。
Without gravity there would be no air and no sound of any kind.
如果没有地心引力，将不会存在空气和任何声音。
And for the sake of simple, we considered a 2d model without gravity.
为简单起见，本文主要考虑的是一个二维无重力模型。
Well, that is the difference between the equation with gravity and without gravity.
该差值即是存在重力,与不存在重力方程的解之差。
Well, that is the difference between the equation with gravity and without gravity.
该差值即是存在重力,与不存在重力方程的解之差。
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