We are participating in local mutual aid activities.

We will co-sponsor this event with the city.

I think these teaching materials will be very useful for the students.

Humans and nature should coexist.

He was assigned to the school as a new teacher.

He is teaching mathematics to the students.

His guitar strings produced a beautiful resonance.

His words resonated with my heart.

He received a letter of threat.

He threatened me and forced me to reveal the secret.