Fifty years later, lasers are a staple in everything from astronomy, surgery and DVD players to cutting sheet metal.
五十年后，激光的用途遍及天文学、外科手术、DVD播放器到金属切割。
Fifty years later, lasers are a staple in everything from astronomy, surgery and DVD players to cutting sheet metal.
五十年后，激光的用途遍及天文学、外科手术、DVD播放器到金属切割。
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