The airplane violated our country's airspace without permission.

Exchanges between both countries are becoming more active.

Please add an appropriate amount of salt according to the recipe.

He has the ability to solve that problem.

The Ritsuryo system is one of the laws that defined ancient Japanese society.

He was angry like a field set ablaze.

He was standing on his two feet.

The two poles of the Earth are the North Pole and the South Pole.

This species of frog is hermaphroditic, able to change its sex as needed.

The United States has adopted a bicameral system.