Tidal force is the force that causes the tides of the Earth's oceans.

He demonstrated strong willpower to overcome the difficulty.

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

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

This tin toy is old, but it's still beautiful.

His ability to judge is very excellent.

Her femininity is truly wonderful.

His speech has persuasiveness.

His ability to concentrate is astonishing.

The extent of his vocabulary strength indicates that he is an avid reader.