raceway for wiring

例句：

1. 1. The raceway is designed to allow water to flow through it easily.
   该管道设计用于使水流通过它时畅通无阻。
2. 2. The engineer used a conduit to carry the heavy equipment through the tunnel.
   工程师使用一个导管将重型设备穿过隧道。
3. 3. The channel between the two countries has been narrowed due to trade tensions.
   由于贸易紧张，两国之间的通道已经变窄了。