undercourse
底层
垫层
例句
Revetments must be sturdy and durable, able to resist damages caused by various factors. Their undercourse must not be scoured.
对上下游护坡的要求是坚固耐久，能抵抗各种因素的破坏作用，并保证底层不受淘刷。
The paper mainly introduces the major effect and scope of application of undercourse method in the course of treating foundation.
主要介绍了地基处理中垫层法的主要作用及适用范围。
