外科医生在精细的手术中使用了一束精确的激光。

The surgeon used a precise ___laser beam during the delicate operation.

现代医学常常依赖像激光这样的工具进行手术和治疗。

Modern medicine often relies on tools like the ___laser for surgery and treatment.

演讲者用激光笔来突出屏幕上的关键信息。

The presenter used a ___laser pointer to highlight key information on the screen.