selsyn receiver

例句：

1. 1. The selsyn receiver is used to detect the presence of certain chemicals in the air.
   选择器用于检测空气中某些化学物质的存在。
2. 2. The filter was designed to remove impurities from the water before it was released into the tap.
   过滤器被设计用来在水释放到水龙头之前去除杂质。
3. 3.The synthesizer produces new materials by combining different elements.
   合成器通过结合不同元素来产生新材料。