The feature of XB series gem microscope is the moveable outer ring of dark vision field`s focus lens;this increases the observing angle,measure gemangle become possible.是什么意思_The feature of XB series gem microscope is the moveable outer ring of dark vision field`s focus lens;this increases the observing angle,measure gemangle become possible.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句