When he steamed and stretched the wool, the x-ray pattern showed a new repeating structural unit at a spacing of 7.0 ?.是什么意思_When he steamed and stretched the wool, the x-ray pattern showed a new repeating structural unit at a spacing of 7.0 ?.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句