channel theory

例句：

1. 1. The company uses various channels to reach its customers.
   该公司使用各种渠道来接触其客户。
2. 2.The new channel will allow us to expand our market reach.
   新的渠道将使我们能够扩大市场覆盖范围。
3. 3.The engineer used a channel to divert the water from the river.
   工程师利用一个渠道将河水从河中引走。