He is suffering from depression.

We need to minimize the system's downtime.

We have to fill in this hole.

The character '喰' means to eat.

I eat breakfast every day.

Down quarks play an important role in particle physics.

A quark is a type of elementary particle.

The road is blocked and I can't pass through.

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

His music skillfully uses dissonance.