挖掘机的英文是excavator，来源是拉丁语"excavare"和英语"excavate"的变体，意思是挖掘、挖开。例句如下：

The excavator dug a deep hole in the ground.

The excavator was used to clear the rubble from the collapsed building.

The excavator has a long arm with a scoop on the end for digging.