You cannot walk up against gravity.
你无法逆着重力运动。
David Levinson: it has its own gravity. What goes up must come down.
大卫·莱文森:它有自己的重力场,上去的一定会掉下来。
We must wake up to the gravity of the situation.
我们必须认识到事态的严重性。
A DISK's ROTATION holds it up against gravity.
圆盘的旋转可抵挡重力以支撑本身的结构。
A DISK's ROTATION holds it up against gravity.
圆盘的旋转可抵挡重力以支撑本身的结构。
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