compound dredger的用法和樣例：
例句
- As the ponds are quite small and not very deep, it has been proposed that a single grab dredger be used for the operation.
由於池塘面積較小而且水不太深，已建議在操作時使用單抓鬥挖泥機。 - Where tight dredging depth tolerances are required to dredge contaminated materials the bucket-type closed-grab dredger shall incorporate a visor.
在挖掘受污染物料時，若嚴格規定了挖泥深度容限，則密封抓鬥式的挖泥機應設置一個護罩。
