target group(A collection of people selected and approached by some entity for a variety of purposes, including assistance, recruitment, information dissemination, marketing and research)
zinc(A brittle bluish-white metallic element that becomes coated with a corrosion-resistant layer in moist air and occurs chiefly in sphalerite and smithsonite. It is a constituent of several alloys, especially brass and nickel-silver, and is used in die-casting, galvanizing metals, and in battery electrodes)
