returnern.(离职生养小孩一段时间后)复职的妇女；回归者returnv.返回；归还；回报；回应；申报n.归还；返回；（收益)回报；申报returning cycle[医] 恢复周期(由额外收缩开始的心搏周期)return streamer回返闪流returned letter退回的信return shipment再运出；运回Returns effects回报效应returning water[医] 回水return on court返回球场return postcard来回明信片return cylinder回程缸return coupling反馈,回授

1. This paper presents the principle and method for measuring various microwave devices return loss by spectrum analyzer and analyses the uncertainty of measurement.
   介绍了频谱分析仪测量各种微波器件回波损耗的原理和方法，并对测量结果的不确定度进行了分析。