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.

Beautiful Chinese fountaingrass is growing in my garden.

The secret to his success lies in his amazing fortitude.

He has amazing stamina.

His stamina is astonishing.

The van der Waals force is an important concept in explaining intermolecular interactions.

He has a high ability to hold a conversation, so he can get along with anyone quickly.