laser

The surgeon used a precise laser to perform the delicate operation on the patient's eye.

(Chinese) 外科医生使用精确的激光为病人的眼睛进行精细手术。

A laser beam can be used to scan barcodes on products at the supermarket checkout.

(Chinese) 激光束可用于在超市结账处扫描产品上的条形码。