它在现代最为雄心勃勃的应用出现在1961年，华盛顿州的塔科马港市修建了一个移动人行道的“攀梯”。
Its most ambitious use in modern times came in 1961, when the city of Tacoma in Washington built an underground "escalade" of moving sidewalks.
它在现代最为雄心勃勃的应用出现在1961年，华盛顿州的塔科马港市修建了一个移动人行道的“攀梯”。
Its most ambitious use in modern times came in 1961, when the city of Tacoma in Washington built an underground "escalade" of moving sidewalks.
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