prematurity
  早熟,過早,早開花
  pre·ma·tu·ri·ty =/-məˈt(j)ʊrətɪ, ˈʧʊr, <ɪ>ʧɪɛflj ɑrɪtɪʃɪ> ˌprɛmə-/= 名詞
  早產,早熟,早熟性
  Pre·ma·tu·ri·ty n.  The quality or state of being premature; early, or untimely, ripeness; as, the prematurity of genius.
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  prematurity
       n : the state of being premature [syn: prematureness]