drainage channels短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 🌏排水箱涵；排水道 Canals and drainage channels, ditches. 人工运河、排水渠、壕沟。 com They did this by digging huge networks of drainage channels and raising their fields so that roots sat above intruding seawater. 原来，当地人学会开挖河沟，并连接成庞大的排洪系统，同时加高了土地，使作物根部保持在入侵的海水上方。 yeeyan