an·ces·try /ˈænˌsɛstri/
  祖先,世系,血統
  An·ces·try n.
  1. Condition as to ancestors; ancestral lineage; hence, birth or honorable descent.
     Title and ancestry render a good man more illustrious, but an ill one more contemptible.   --Addison.
  2. A series of ancestors or progenitors; lineage, or those who compose the line of natural descent.
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  ancestry
       n 1: the descendants of one individual; "his entire lineage has
            been warriors" [syn: lineage, line, line of descent,
             descent, bloodline, blood line, blood, pedigree,
             origin, parentage, stemma, stock]
       2: inherited properties shared with others of your bloodline
          [syn: lineage, derivation, filiation]