Sentence:  After removing the <WSD>bench</WSD>, we can use the mark left on the wall as a reference point. 
Meaning of the word marked with <WSD> tags:  A bracket used to mount land surveying equipment onto a stone or a wall.<ref>[http://www.etymologie.info/~e/u_/us-manage.html#Benchmark Description of bench], as part of the "benchmark" etymology.</ref>