The fire extinguisher is __the wall ___the back staircase第一个填in,第二个填at,为什么?特别是第一个,在墙上不应该是on吗?

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The fire extinguisher is __the wall ___the back staircase第一个填in,第二个填at,为什么?特别是第一个,在墙上不应该是on吗?
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The fire extinguisher is __the wall ___the back staircase第一个填in,第二个填at,为什么?特别是第一个,在墙上不应该是on吗?
The fire extinguisher is __the wall ___the back staircase
第一个填in,第二个填at,为什么?特别是第一个,在墙上不应该是on吗?

The fire extinguisher is __the wall ___the back staircase第一个填in,第二个填at,为什么?特别是第一个,在墙上不应该是on吗?
因为灭火器是镶嵌在墙里的,所以用in .
如果是画picture则要用on.
at the back staircase.在楼梯间,既不是in也不是on,指标是其所在位置,用at+some place.
hope it is helpful for you.

因为灭火器是镶嵌在墙里的，所以用in ，如果是壁画挂在墙上，在墙的表面就用on

不是挂在墙上的就用in。
例如：There are some windows in the wall.
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