He left the house a moment ago.

He left the house a short time ago.

He has a deep interest in the study of ancient Japan.

The national defense of our country is the responsibility of all of us.

He traveled various countries and learned many cultures.

He traveled to various countries and learned about their cultures.

The economic development of emerging countries is having a major impact on the world economy.

He is planning to return to his country next week.

He is planning to return to his country next week.

This park is state-managed, and the management is very well organized.