channelling

The channelling in the stone floor directs rainwater to the drain.

用法提示：此处 channelling 是名词，指地面的沟槽或凹槽，在句中作主语。

The builders cleaned the channellings in the concrete wall to prevent water from seeping through.

用法提示：channellings 是名词 channelling 的复数形式，在句中作宾语，指多条沟槽。

The channelling of relief supplies to the mountain villages took all morning.

用法提示：此处 channelling 是抽象名词，表示“引导、输送”的行为，后接 of 短语作主语。