keke99 What does the underlined "them" refer to? There is a misprint or a mistake. "escalator" should be "escalators".
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keke99 What does the underlined "them" refer to?There is a misprint or a mistake. "escalator" should be "escalators". Then "them" refers to "escalators", thus:
keke99the writer could have made a mistake.Yes. The writer or the editor, but in any case somebody made a mistake.