1N-COUNT 激光 A laser is a narrow beam of concentrated light produced by a special machine. It is used for cutting very hard materials, and in many technical fields such as surgery and telecommunications. 激光
...new laser technology.
新的激光技术
Researchers realised that a tunable laser beam might be useful in surgery.
研究人员意识到，可调谐激光束也许可以用在外科手术中。
2N-COUNT 激光器 A laser is a machine that produces a laser beam. 激光器