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jackhammer (portable percussive drill device) / any other type of rock drill
He was repairing the road using a jackhammer.
Alternative form of 削岩機
This rock drill is very efficient and can quickly cut through rock.
(petrology) breccia
This area is rich in breccia.
(petrology) gabbro
This area is rich in gabbro.
(petrology) diorite
This mountain is made of diorite.
extravehicular activity
He is undergoing training for extravehicular activity.
engage in an extravehicular activity
He engaged in an extravehicular activity from the spaceship.
catamaran
We crossed the sea by catamaran.
a shipworm
The shipworm is known for eating wood.
microbiology
I am majoring in microbiology at university.
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