激光 (jī guāng): laser

The doctor used a laser to perform surgery on the patient; the wound was very small, and recovery was quick.

In the physics lab, the students used a laser to measure the speed of light, and the result was very accurate.

Factory workers use a laser to cut steel plates; the edges are smooth and free of burrs.

The red dot from the laser pointer shone on the screen, helping the speaker indicate the key points.

Scientists use lasers to cool atoms to near absolute zero in order to study quantum phenomena.

At the concert, lasers changed colors with the rhythm of the music, illuminating the entire stage.