(noun.) the property of a more than adequate quantity or supply; 'an age of abundance'.
(noun.) (chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million.
(noun.) (physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present.
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汉弗莱手打