In spring, the amount of water in the river increases due to the melting of snow.

The volume of water in this dam is not sufficient.

The population is increasing rapidly.

Spring has come and the cherry blossoms have started to bloom.

We often have picnics by the river on weekends.

We often have picnics by the river on weekends.

We have a picnic by the river every weekend.

Spring has come and the cherry blossoms have started to bloom.

This bacteria multiplies exponentially.

A water strider was floating on the pond in the park.