1. The technique involves two GPS receivers: a roving unit and a reference unit that is placed at a known location. 这项技术使用两个GPS接收器，一个为动态单元，一个为放置在已知地点上的参考单元。
2. The adjust procedures of the electricity parameters of roving frame are introduced to improve the evenness of roving. 介绍了粗纱机电气参数调节的方法，从一个新的方面对提高粗纱条干提出了看法。
3. The reference device transmits the differences between its measurements and the computed ranges to the roving receiver, which then uses the data to correct its reported location. 参考器材会把已知的测量值与计算所得距离之间的差异，传送给动态仪器，动态仪器再根据这项差值，校正呈报的位置。
英英解释
n.
1. travelling about without any clear destination
2. (of groups of people) tending to travel and change settlements frequently
