Yesterday, our country's airspace was violated by the enemy nation.

North Korea has violated our country's airspace again.

We installed a new flowmeter in the factory.

兩唇音 is a type of sound produced using the lips.

The ritsuryō system was a system that ruled ancient Japanese society.

The shape of this chamfered cube is mathematically very interesting.

This is my new work, a chamfered cube.

This chamfered cube is one of the shapes in mathematics, and it has the characteristic that all faces are equal.

The subscription fee for this magazine is 1000 yen per month.

In this research, quantitative data analysis plays an important role.