ab·a·tis /ˈæbəˌti, ˈæbətəs/
  鹿柴,拒木,鐵絲網
  Ab·a·tis, Aba·t·tis, n.  Fort. A means of defense formed by felled trees, the ends of whose branches are sharpened and directed outwards, or against the enemy.
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  abatis
       n : line of defense consisting of a barrier of felled or live
           trees with branches (sharpened or with barbed wire
           entwined) toward the enemy [syn: abattis]