对一组使用新药，对另一组则使用旧药以资对照。 One group was treated with the new drug, and a second group was treated with the old one as a control.
对照物对比平行的成分、项目或主题 A contrasting but parallel element, item, or theme.
对比染色剂，对照染色剂一种对比颜色的染色剂，用来染制主染色剂染后显不出的显微术标本成分 A stain of a contrasting color used to color the components in a microscopic specimen that are not made visible by the principal stain.
白色的墙壁与黑色的地毯形成了鲜明的对照。 The white walls make a contrast with the black carpet.
