I'm troubled by his unproductive attitude.

He was affected by secondary effects.

The United Kingdom of Great Britain and Northern Ireland is a country located in Europe.

The Tangut language is one of the ancient languages of China.

He wrote his name using a logogram.

In Vietnamese, there are many Sino-Vietnamese words borrowed from Chinese.

He can speak Somali.

He started learning Okinawan language.

I want to learn Taiwanese.

He started learning the Chinese language.