The expansion of this problem should be limited.

In this classical literature, the technique of kakarimusubi is skillfully used.

He is traveling around the world as an ecologist.

We must strive to protect the natural environment.

We should recycle to prevent environmental pollution.

We need to solve the problem in the production environment.

It took a long time to set up the development environment.

The person in charge is currently out of office.

He remembered something funny and let out a guffaw.

He guffawed after hearing a funny joke.