The fire alarm went off, so we immediately evacuated the building.

A tsunami warning has been issued, so please evacuate immediately.

A visitor has come.

I attend psychotherapy sessions every week.

Next month, I will apply for a visa for my visit to China.

I plan to visit China next month.

He wrote a poem using the four treasures of the study.

An arc discharge occurs when electricity passes through the air.

Trigonometry is a branch of mathematics that studies the relationship between angles and triangles.

We like to watch satellite broadcasting at home.