The lines of force in the magnetic field can be visualized using iron filings.

The low lines on the road indicate the direction of traffic.

The ship's lubber lines were used to mark the position of the anchor.

The boat had multiple leech lines to control the shape of the sails.

The mothers' lines on her face showed the wisdom and love she had gained over the years.

The pectinate lines on the surface of the leaf are clearly visible.

The picket lines outside the factory were growing longer.

The pierhead lines were painted in bright colors.

The police lines were set up to control the crowd.

The mathematician studied the properties of real lines.