I work at a travel agency.

That traveller is travelling around the world.

The passenger pigeon is an extinct species that was once very common in North America.

My dream is to time travel.

The greenhouse effect is causing the earth's temperature to rise.

The Allee effect refers to the phenomenon where the survival rate decreases when the number of individuals is small.

This method is very effective.

Our teamwork created a synergy that led the project to success.

His play surprised the audience by using the Verfremdungseffekt.

Due to the skin effect, the current mainly flows on the surface of this wire.