An irregular galaxy is a type of galaxy that does not have a definite shape.

He sent a reminder letter about the unpaid charges.

He is a scholar who is knowledgeable about court and samurai traditions.

This perfume is mixed with the scent of benzoin.

I am surprised at the quickness of this project's progress.

His actions were beyond our speculation.

Tomorrow, we will go on an excursion.

We need accurate measurements for the science experiment.

This new jet can fly at supersonic speeds.

His hobby is astronomical observation.