undercourse
美 英
英漢解釋
例句
Revetments must be sturdy and durable, able to resist damages caused by various factors. Their undercourse must not be scoured.
對(duì)上下游護(hù)坡的要求是堅(jiān)固耐久,能抵抗各種因素的破壞作用,并保證底層不受淘刷。