适合清洁各种不同规格的自动步梯。
Automatically lifting cleaner is fit to clean all kinds of escalators.
她一步迈四阶楼梯，把自己锁在她的房间里了。
She took the stairs four at a time and locked herself up in her room.
其不同点在于梯步和栏杆支柱的处理各有千秋。
Its differentia depends on the processing each has his strong point of ladder pace and baluster.
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