The syrinx of birds can produce different sounds depending on the species.

Have you ever seen a trumpeter swan at the lake in the park?

Mizunari is my best friend.

He is brushing his upper teeth.

He is brushing his lower teeth.

He smiled, showing his lower teeth.

In the Edo period, women blackened their teeth as a symbol of beauty.

If you don't brush your teeth every day, dental plaque can accumulate and potentially cause cavities.

While waiting for the test results, he gritted his teeth.

He died young.