شانزدهم - استفاده از کلمات ۲

Hello, guys! Welcome to “A Valuable Discovery”, our story for lesson 16.

The laser is a marvelous device that sends out a slender, concentrated beam of light, a light that surpasses the light at the sun’s surface. So vast* is the laser beam’s power that it has without a doubt* the capacity* to vaporize* any substance located anywhere on earth. The laser can penetrate* steel, pierce* a diamond, or make an accurate* die for wire so thin that it can be seen only with a microscope. Grateful eye surgeons report that they have used laser beams to repair the retinas in some fortunate* patients by creating tiny scars that joined the retina to the eyeball. Pioneering* medical men are making cautious* exploration* into cancer cures with the laser, confident* that they will alter* the course of this brutal* disease.

This is the end of our story, “A Valuable Discovery”. See you next time, goodbye.