An airplane can fly in the sky due to lift.

Our country's military power is the strongest in the world.

Our military force is significantly inferior to the enemy's.

Even as he gets older, his virility does not diminish.

The topography of this area was mainly formed by the geomorphic agent of wind.

He is practicing hard to avenge the embarrassment of last year's defeat.

He practiced hard to make up for his previous failure.

The earth's gravitation is pulling us towards the ground.

Violence is not the way to resolution.

His mathematical ability is very high.