Underground means under the level of the ground; belowground storage areas; underground caverns.
Underwear is defined as clothing or an article of clothing worn next to the skin and under other clothing. Boxer shorts, briefs, thongs, bikini, boxer briefs, panties etc.
Unleaded gasoline is characterized as gasoline that contains less than 0.0018 ounces (0.05 grams) of lead per gallon (3.785 liters).
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Lead (Lead refer to the following: 1. A bluish-white ...)