channel stopper

例句：

1. 1. The new TV channel blocker has been causing a lot of problems for the broadcasters.
   新的电视频道阻塞器给广播商带来了很多麻烦。
2. 2.The engineer used a channel blocker to prevent interference during the test.
   工程师使用了一个频道阻塞器来防止测试中的干扰。
3. 3. The channel blocker was designed to prevent unauthorized access to sensitive information.
   这个通道阻塞器被设计用来防止未经授权访问敏感信息。