... portable magneto-telephone switch board ==> 便携式磁石电话交换机 portable map board ==> 轻便图板 portable meridian circle ==> 轻便子午环 ...
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A portable surveying instrument consisting essentially of a drawing board and a ruler mounted on a tripod and used to sight and map topographical details.
一种便携式观测仪器，主要包括安放在三脚架上的绘图板和一把直尺，用于观测和绘制地形详图。
After discussing a series of problems that tourists faced, a personal tourism assistant designed with a portable computer, a GPS board, a GPRS transceiver and electronic map technology was introduced.
针对游客旅游时的诸多不便，利用手持计算机、电子地图、GPS及GPRS收发器实现了一种个人旅游助理。
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