我的老师事实上是一名绘图机构的技术员，他大致介绍了如何用传统仪器来画地图，而且他强调了如何用GPS来制作地图。

Our lecturer, who was actually atechnician from a mapping institute, briefly introduced how to use sometraditional equipment to draw maps, and he put all emphasis on how to use GPS to make a map.

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他叫他们做练习3，但不要画地图。

He tells them to do exercise 3, but not to draw the map.

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他按比例画那幅地图，每一英寸代表50英里。

He drew the map to scale, making one inch represent50 miles.

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