He looked at the palm of his hand and thought about the fate written on it.

He changed his opinion as if flipping his hand.

He solved the problem as easily as turning his hand over.

He practices Baguazhang in the park every day.

He is managing the game as a server administrator.

He underwent surgery for a ureteral stone.

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

This old radio uses a tetrode.

This old radio uses a triode.

This old clock uses a Nixie tube.