found·ling /ˈfaʊn(d)lɪŋ/
  棄兒,拾來的孩兒
  Found·ling n.  A deserted or exposed infant; a child found without a parent or owner.
  Foundling hospital, a hospital for foundlings.
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  foundling
       n : a child who has been abandoned and whose parents are unknown
           [syn: abandoned infant]