It is through radio signals to identify a specific target, read and write the corresponding data, without mechanical or opticalcontact with the identification system.
它通过无线电信号识别特定的目标，并读写相关的数据，而不需要识别系统与这个目标有机械或者是光学接触。
2
The vehicles used radar and optical sensors to compute their proximity to each other and guide their final approach and contact.
航天飞行器试用雷达和光学传感器来计算彼此距离来完成最后的接触和对接。
3
A non invasive and non contactoptical method to measure muscle vibration frequency and amplitude is introduced.