medium coverts

例句：

1. 1. The medium covert is used to transmit signals over long distances without interference.
   中继器用于在长距离上传输信号，而不受到干扰。
2. 2.In the old days, medium coverts were common in communication systems.
   在旧时代，中继器在通信系统中很常见。
3. 3.The engineers designed a new medium covert that could handle more data than its predecessor.
   工程师们设计了一种新型的中继器，可以处理比其前代更多的数据。