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当你来到雄伟壮丽的北京火车站时,一进中央大厅就会看到四台自动的楼梯(图1),把乘客连续不断地送上楼去—这就是本文要介绍的自动扶梯。
When you come to the majestic Beijing Railway Station, you will see four automatic stairs (Figure 1) as you enter the central hall, sending passengers upstairs - this is the escalator to be introduced in this article.