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ring

/ɹɪŋ/ 名词 C2

中文: 集环

  1. A family of sets that is closed under finite unions and set-theoretic differences.
  2. A family of sets closed under finite union and finite intersection.

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来自图书馆

_I’ll_ soon make you dry enough!” They all sat down at once, in a large ring, with the Mouse in the middle.
《Alice's Adventures in Wonderland》,第16页 · B2
However, it was over at last, and they sat down again in a ring, and begged the Mouse to tell them something more.
《Alice's Adventures in Wonderland》,第19页 · B2
At eight o’clock the next evening Aunt Ellen took a quaint old gold ring from a moth-eaten case and gave it to Richard.
《Six stories from The Four Million》,第12页 · C1
Young Rockwall took the ring reverently and tried it on his smallest finger.
《Six stories from The Four Million》,第12页 · C1

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