He was carefully observing the surroundings.

The insect is sensing its surroundings using its antennae.

I will work using this laptop.

His hobby is collecting insects.

We must strive to protect the environment of the Earth.

He is using that coat from winter to spring.

You need to use your head to solve this problem.

He is an expert in entomology, especially knowledgeable about butterflies.

Insects are an important part of the natural world.

He is world-famous as an entomologist.