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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 ...

“步测”的拼音为：bù cè...