便携式经纬仪;轻便中星仪

portable transit的用法和样例：

例句

The surveyors were adjusting the transit to take the measurements.勘测员正调试转镜经纬仪进行测量。
Because of the special bucket foundation constructure, it is difficult to measure the bucket foundation installation error by using transit.根据桶形基础的特殊形式，采用普通经纬仪对桶基安装误差进行测量是比较困难的。

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