名词
中文翻译：冲击器
同义词：
['hammer', 'sledgehammer']
例句：
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1. The carpenter used a jack-hammer to remove the old board.
木匠用冲击器把旧木板拆掉了。
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2. The construction workers were using jack-hammers to break through the concrete wall.
建筑工人正在使用冲击器来打破混凝土墙。
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3. He jack-hammered the door until it finally opened.
他用力敲击门直到它终于打开了。