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Gravitational redshift - Wikipedia, the free encyclopedia

In astrophysics, gravitational redshift or Einstein shift is the process by which electromagnetic radiation originating from a source that is in a gravitational field is reduced in frequency, or redshifted, when observed in a region of a weaker gravitatio...

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披薩,一種全球流行的意大利美食,粉絲無數.. 進入各國各地每一家披薩店,人們總能看到那幾道萬年不變的經典款披薩,其中一種是: 夏威夷披薩(Hawaiian Pizza)。     夏威夷披薩,有些地方也叫鳳梨披薩,是將鳳梨切成小塊,和火腿片一起放在披薩麵餅上,最後再放...

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