| 1 | Lasers can be used to perform operations nowadays. | |
| 2 | How do scientists control brain cells with lasers? | |
| 3 | Where' s the laser lens for this new material? | |
| 4 | It also will measure the brightness of each laser reflection. | |
| 5 | My laser printer is out of ink and I need to print out something urgent. |
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