gravel trap是什么意思

用法例句

The technical requirements and ecological effects of the technique for ecological bank protection by wooden fences and gravel boxes were systematically studied for Linzhuanggang ecological rehabilitation project in Taihu Lake Basin.

1%,同时生态护岸建设前后河段内底栖动物结构、种类和优势物种均出现明显变化,底栖动物的类群发生了由耐污类群为主向中间类群为主的转化,说明木栅栏砾石笼护岸对林庄港河流生态系统的改善和修复有良好的效果。