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2024年5月27日 · Discover the mathematical concept of the golden ratio, a proportion found in nature and art that has fascinated mathematicians for centuries.
3 天前 · Gold often occurs in free elemental ( native state ), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum ), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite.
