The apical membrane of the epithelial cells is apparently essential.上皮细胞的顶膜显然是必要的.Nothing but a great many epithelial cells was observed in the stain.染片中只观察到有大量的上皮细胞.Epithelial tissue occurs most commonly in sheets.上皮组织通...
Double - black duotone: A duotone created from two black plates.双黑双色调: 由两块黑版印制的双色调.Double - tone half - tone : A colour plate printed slightly out of register to create a duotone effect.双重 半色调: 用一颜色印版,作稍为不准的套印,从而产生双色调的效果...