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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Bolt from the blue: Seen from the Hancock Tower, lighting strikes both the Willis Tower, right, and the Trump Tower in downtown Chicago as a severe storm rolls through the region last night.

突如其来：芝加哥市中心昨天遭遇一场暴风雨，从汉考克大厦看出去，闪电刚好同时击中威利斯大厦(右)和川普大厦。

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Bolt from the blue: Seen from the Hancock Tower, lighting strikes both the Willis Tower, right, and the Trump Tower in downtown Chicago as a severe storm rolls through the region last night.

突如其来：芝加哥市中心昨天遭遇一场暴风雨，从汉考克大厦看出去，闪电刚好同时击中威利斯大厦(右)和川普大厦。

youdao