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3 天前 · Clockwise from upper left: an 1887 self-portrait by Vincent van Gogh; a female ancestor figure by a Chokwe artist; detail from The Birth of Venus (c. 1484 –1486) by Sandro Botticelli; and an Okinawan Shisa lion Art is a diverse range of human activity and its resulting product that involves creative or imaginative talent generally expressive of technical proficiency, beauty, emotional power ...
1 天前 · Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is. The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
1 天前 · Sustainability is a social goal for people to co-exist on Earth over a long time. Definitions of this term are disputed and have varied with literature, context, and time. [2] [1] Sustainability usually has three dimensions (or pillars): environmental, economic, and social. [1] . Many definitions emphasize the environmental dimension.
1 天前 · Africa is the world's second largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] . With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human population.
3 天前 · The "Third Chinese Empire" (中華第三帝國) consisted of the Liao dynasty, the Jin dynasty, the Yuan dynasty, the Ming dynasty, and the Qing dynasty. Accordingly, the terms "Chinese Empire" and "Empire of China" need not necessarily refer to imperial dynasties that had unified China proper.
3 天前 · American Airlines is a major airline in the United States headquartered in Fort Worth, Texas, within the Dallas–Fort Worth metroplex. It is the largest airline in the world when measured by scheduled passengers carried, revenue passenger mile.
3 天前 · Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. [2] . Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates.
