His posthistory was very interesting.

After school, we study at the library.

He sneaked into the school through the back gate.

He suffered a minor contusion on his occiput.

The trailing edge of this airplane has a very unique shape.

He likes to take a walk in the park at dusk.

Back vowels are vowels that are pronounced using the back of the tongue.

A back vowel is a sound where the back of the tongue approaches the palate.

Postfix notation is one method of expressing calculations.

Tokudaiji Sanesada, also known as Goto Tokudaiji Sadaijin, was a court noble and a literary person during the Heian period.