coded transmitter

例句：

1. 1.The coded transmitter was used to send secret messages.
   编码发射机被用来发送秘密信息。
2. 2. The engineers had to use a coded transmitter to communicate with each other.
   工程师们不得不使用编码发射机来相互交流。
3. 3. The coded transmitter helped us to secure the communication channel.
   编码发射机帮助我们确保了通信通道的安全。