4周搞定2000+托福核心词
petard
常考释义
n. to hoist yourself with your own petard;to hoist yourself by your own petard：搬起石头砸自己的脚；害人反害己；自食其果；作茧自缚
The Campbell government has been hoisted by its own petard by a lot of its pre-election rhetoric.
坎贝尔政府为谋求当选而说的许多空话已经使其自食其果。
n. （旧时炸城墙、门等的）攻城炸药箱【军】
n. （炮兵用的）烟火信号弹
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