Stoma of walnut is a good specimen for scientists to exactly discriminate the boundary of stomata with outer ledges of ventral wall of guard cells.是什么意思_Stoma of walnut is a good specimen for scientists to exactly discriminate the boundary of stomata with outer ledges of ventral wall of guard cells.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句