目的：这项研究的目的是评估一种新的微型机器人系统为腰椎放置椎弓根螺钉提供无源制导。
Objective. The idea of this study was to evaluate a new miniature robotic system providing passive guidance for pedicle screw placement at the lumbar spine.
毫米波辐射计是一种典型的无源微波探测系统，在遥感和制导中获得了广泛的应用。
Widely used in guidance and remote sensing, millimeter wave radiometer is a typical microwave passive detection system.
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