He sent a message to the distant ship using flag semaphore.

He was controlling traffic using hand signals as a traffic police officer.

The ship entered the port flying a quarantine flag.

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.

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.

That plan had the opposite effect.

The special effects of this movie are really amazing.