Geologists believe that this area was formed by a graben.

The treatment efficacy of this medicine is very high.

I'm always impressed by his skillful handiwork.

He dug a hole in the ground and stored vegetables.

The unity of knowledge and action means that knowledge and action become one.

He is working round the clock.

He is majoring in aerospace engineering.

He is majoring in astronautics.

Astronautics is a field of study related to the exploration of space and the design of spacecraft.

I purchased a new car.