“步测”造句

我在地面上作了标记，然后为了确保起见步测了一下。
I marked the ground and then paced it out to be sure.

我估计这大厅有80米长; 我来步测一下.
I think the hall is 80 metres long; I'll pace it.

先步测20英尺,再在地上做出标记.
Step off twenty feet and then place a marker in the ground.