... 四能级系统:four-level system 四能级激光棒:four-level laser rod 四能级放射体:four-level emitter ...
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四能级激光棒 four level laser rod; four-laser rod; four-level laser rod 掺钕钇铝石榴石激光棒 neodymiumdoped yttrium aluminum garnet laser rodss .
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