Double acting baking powder — or cream of tartar, has two acids, one is the same as in single acting, the other one remain inactive till its heated. (litebite.in)
Indeed, «What exists are men and women who yield to impulses and surrender to activities quite diverse and always complex,» but do we conclude that there are only single acts of adultery and no such thing as adultery and adulterers? (firstthings.com)
«But we can make a difference, it just hast to start with one single act at a time.» (sportstarsmag.com)