The potential energy of this ball is proportional to its height.

This park is an energy spot for the local people.

This park is known as a local energy spot.

We should increase the use of alternative energy to protect the earth.

We should save electricity for energy conservation.

We need to find a new source of supply.

We are looking for a new supplier.

We installed solar batteries on the roof of our house.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.

He drew a hendecagon shape.