Whether you take the elevator to the top of the Hancock Tower or whether you walk up the stairs, the change in gravitational potential is identical.
不管你是乘电梯，去大厦的顶层，或者是步行，重力势能的变化是相同的。
Whether you take the elevator to the top of the Hancock Tower or whether you walk up the stairs, the change in gravitational potential is identical.
不管你是乘电梯，去大厦的顶层，或者是步行，重力势能的变化是相同的。
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