This is a small, flat mirror that serves to move the image formed by the primary to the side of the tube, where it is viewed with an eyepiece.是什么意思_This is a small, flat mirror that serves to move the image formed by the primary to the side of the tube, where it is viewed with an eyepiece.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句