riprap stone

例句：

1. 1. Riprap is used to reinforce riverbanks and prevent erosion.
   碎石用于加固河岸，防止侵蚀。
2. 2.The engineers decided to use riprap as a temporary solution.
   工程师们决定使用碎石作为临时解决方案。
3. 3.The construction crew was using riprap to build the new embankment.
   施工队正在使用碎石建造新的堤坝。