他们是“老师”，而另外一个人是“学习者”。他们坐在一个机器前，上面有标着逐渐增大的电压值的刻度盘。
Told they would be the 'teacher and another person the' learner ', they sat in front of a machine with a number of dials labelled with steadily increasing voltages.
大地水准测量必须使用刻度标于不胀钢片上的水准标尺。
Geodetic leveling should be done with staves in which the divisions are marked on a strip of invar.
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