My friend lives in Cambodia.

He is learning the phonetic notation of Chinese.

He taught me how to give the phonetic notation of a new word.

The phonetic notation of this kanji is difficult.

He taught me how to phonetically notate the new word.

He is working day and night.

He is studying Japanese script.

It's very interesting to learn about the history of the medieval times.

Let's meet at the actual place.

A centralized political system is one in which all power is concentrated in the central government.