Escalator

例句:

• The escalator is a simple device. 佚名. 神奇的知识之书.
• Another type is that known as the cleat escalator. 佚名. 神奇的知识之书.
• This new and interesting device is known as an escalator. 佚名. 神奇的知识之书.
• This simple but effective device is known as the escalator. 佚名. 神奇的知识之书.
• The Cleat Escalator. 佚名. 神奇的知识之书.
• Both these types of escalators can be made to move up or down by aid of a swinging switch, or two of them can be placed side by side, one moving upward and the other downward. 佚名. 神奇的知识之书.
• The Story in Elevators and Escalators[15] 佚名. 神奇的知识之书.

校对:佩德罗