core_central_region_有道手机词典

1.Because the adopted N layers of rare-earth ion-doped ring-core optical fibers exist in a common central cladding region, the pumping efficiency is greatly improved.
由于采用的N层掺稀土离子环芯光纤存在一个共同的中心包层区，因此极大提高了泵浦效率。
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