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X射线揭示哺乳动物祖先产卵的首个证据

图中描绘了一只夭折于蛋内的丽齿兽幼崽,其原型化石为哺乳动物祖先产卵的观点提供了确凿证据。 (Sophie Vrard/Benoit 等,PLOS One,2026)

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en.wikipedia.org

S - Wikipedia

S, or s, is the nineteenth letter of the Latin alphabet, used in the English alphabet, the alphabets of other western European languages and other latin alphabets worldwide.

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This Jack Hartmann's Alphabet A-Z series for the letter Ss. Learn about the Letter S.Learn that S is a consonant in the alphabet. Learn to recognize the upp...

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S | Letter, History, Etymology, & Pronunciation | Britannica

S, nineteenth letter of the modern Latin alphabet. It corresponds to the Semitic sin “tooth.” The Greek treatment of the sibilants that occur in the Semitic alphabet is somewhat complicated. The Semitic samech appears...

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S - Wiktionary, the free dictionary

5 days ago · S (upper case, lower case s, plural Ss or S's) The nineteenth letter of the English alphabet, called ess and written in the Latin script.