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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.
例句
...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。