挖掘机 用英语怎么说？好像有几个单词都可以表示。

digging machine;
excavating machine;
excavator;
dredger;
scraper;
shovel;
navvy

挖掘机
grab

参考例句
挖泥船:装有挖掘机的船.
Dredger:a barge or boat equipped with a dredge.
我们需要一台挖掘机来平整土地。
We need a mechanical digger to level the ground.
挖泥船装有挖掘机的船或货船
A boat or barge equipped with a dredge.
挖泥船装有挖掘机的船
A barge or boat equipped with a dredge.

excavator