gre·gar·i·ous /grɪˈgæriəs, ˈgɛr-/
  (a.)社交的,群居的
  Gre·ga·ri·ous a.  Habitually living or moving in flocks or herds; tending to flock or herd together; not habitually solitary or living alone. --Burke.
     No birds of prey are gregarious.   --Ray.
  -- Gre*ga*ri*ous*ly, adv. -- Gre*ga*ri*ous*ness, n.
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  gregarious
       adj 1: tending to form a group with others of the same kind;
              "gregarious bird species"; "man is a gregarious
              animal" [ant: ungregarious]
       2: seeking and enjoying the company of others; "a gregarious
          person who avoids solitude"