挖掘机的英文短语是excavator。例句:

The excavator is used to dig trenches and foundations for buildings.
Excavators are useful for many different construction projects, such as grading, digging, and removing debris.

常见的挖掘机术语还有:

Boom: 挖掘机的臂
Bucket: 挖掘机的铲斗
Cab: 挖掘机的驾驶室
Dig depth: 挖掘机的最大挖掘深度
Excavation: 挖掘
Track: 挖掘机的履带

例句:

The excavator has a long boom that allows it to reach deep into the ground.
The bucket on the excavator can be used to scoop up dirt and debris.
The operator sits in the cab of the excavator and controls the movement of the machine.
The excavator has a dig depth of 15 feet, which is perfect for digging foundations for large buildings.
The excavator is being used to dig a trench for a new water main.
The tracks on the excavator help it move easily over rough terrain.