plain core barrel 单层岩心管
plain-frame core box 框架式芯盘
plain frame core box 框架式芯盒
plain steel core plate 平钢芯板
plain core
普通的核心
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The outer layer, or cladding, is plain silica, while the core is doped with germanium.
ECONOMIST: New-age crystals
The plain truth is that the Yahoo core business was in a terrible place a year ago.
FORBES: An Open Letter To The Marissa Mayer Haters
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