monopole double throw switch

例句：

1. 1. The monopole antenna is usedto receive signals from faraway places.
   单极天线用于接收遥远地方的信号。
2. 2. Themonopole antenna was designed to improve thesignal quality.
   单极天线被设计来提高信号质量。
3. 3. The monopole antenna hasa unique ability to focus energy in aspecific direction.
   单极天线具有将能量聚焦到特定方向的独特能力。