vertical sand drain

• 砂井,竖向排水砂沟

vertical sand drain的用法和样例：

例句

1. As a simple and effective method of soft ground treatments,the sand drain preloading method has been widely used in construction projects.
   砂井堆载预压法作为一种简单有效的软土地基处理方法已经在工程中得到广泛的应用。