undercourse

undercourse

 英

  • n.衬层;底层
  • 网络下层

英汉解释

n.
1.
衬层
2.
底层

例句

Revetments must be sturdy and durable, able to resist damages caused by various factors. Their undercourse must not be scoured.

下游护坡要求坚固耐久抵抗各种因素破坏作用保证底层