This sushi uses raw fish.

I went to the locksmith to make a duplicate key.

In order to maintain the security of encrypted communication, we perform key exchanges regularly.

Every morning, I check the lock opening before leaving the house.

I forgot my key and ended up not being able to get into my house.

This ancient ruin is engraved with the shape of a counterclockwise swastika.

He is a second-year high school student.

I learned how to calculate matrices in math class.

He proposed to me, I'm really happy.

Hearing about his success, I'm really happy.