wavefront

""The teacher marked specific points on the map where we needed to label the cities." "

"My brother's imaginary friend always helped him with his math homework. "

"I dropped a small stone into the pond and watched the ripples spread."

"The dry-stone wall used a large, flat through to support the top stones. "

"Dust particles floated in the sunbeam coming through the window. "

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

"continuous firing leads the grooves of a rifle."

"The medium for the experiment was a special liquid solvent. "

"The train is passing the station, changing location. "

"The teacher's lesson plan was together, covering all the key concepts logically. "

"A pendulum oscillates slower as it gets longer."

"The spread of the flu was rapid in the school this week. "