unidirectional

"You drive nails into wood with a hammer."

"The documents pertaining to my car insurance claim are now all submitted. "

"It requires great strength to lift heavy objects."

"The teacher ensured her students that the test would cover only the topics they studied in class. "

"The countertop is a composite of recycled glass and concrete. "

"The traffic is slow during rush hour."

"I brush my teeth regularly to prevent them from turning yellow."

"The majority agreed that the new proposal was the best."

"The students aligned themselves in a neat row before entering the classroom. "

"Asphalt, composed of oil and sand, is a widely used material for roads."

"Keep going in the same direction."

"A CPU is a component of a computer."