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stairs (noun)
建筑物中连接不同楼层的一系列阶梯。
"Be careful when you go down the stairs."
Think of the 'S' in 'Stairs' as the shape of a winding staircase. Remember: 'Stay Safe on Stairs' to keep the 'S' sound...
The stairs is very steep. → The stairs are very steep.
I went to the upstairs. → I went upstairs.
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