以下为句子列表：
英文: A very heavy metal bar used by firefighters and law enforcement officers to break down walls and doors.
中文: 破墙槌一种非常沉重的金属槌，是救火人员和执法官员用来捣破墙和门而用的
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英文: Applying classical wave theory, a concept of equivalent elastic modulus on propagation speed modification of guided wave through variable cross-sectionof metal bar embeded layer was put forward.
中文: 摘要运用波动的经典理论，提出了导波在金属杆嵌入层“变截面”传播时波速改变的“等效弹性模量”的概念。
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