rock-fill drain

例句：

1. 1. The rock-filled drains were designed to prevent water from seeping into the foundation.
   这些填充有岩石的排水沟被设计用来防止水分渗入地基。
2. 2.The engineer had to replace the rock-fill drains with more efficient ones.
   工程师不得不用更高效的排水沟来替换这些岩石填充的排水沟。
3. 3.The construction crew carefully removed the old rock-fill drains and replaced them with new ones.
   施工队小心翼翼地移除了旧的岩石填充排水沟，并换上了新的。