n. 鹿砦, 有刺铁丝网

[ noun ]
a line of defense consisting of a barrier of felled or live trees with branches (sharpened or with barbed wire entwined) pointed toward the enemy
<noun.artifact>

Abatis \Ab"a*tis\, Abattis \Aba"t*tis\, ([a^]b"[.a]*t[i^]s;
French [.a]`b[.a]`t[=e]") n. [F. abatis, abattis, mass of
things beaten or cut down, fr. abattre. See {Abate}.] (Fort.)
A means of defense formed by felled trees, the ends of whose
branches are sharpened and directed outwards, or against the
enemy.