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1. Oxford Dictionary

   caesium

   • IPA[ˈsiːzɪəm]

   英式

   • n.
     the chemical element of atomic number 55, a soft, silvery, extremely reactive metal. It belongs to the alkali metal group and occurs as a trace element in some rocks and minerals.

   • noun: caesium

2. • 相關詞

   caesium clock

   • n.
     an atomic clock that uses the vibrations of caesium atoms as a time standard.

   Oxford Dictionary