名词
中文翻译：投石机
同义词：
['throwing machine', 'stone thrower']
例句：
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1. The soldiers used pitch pavers to clear the path for the parade.
士兵们使用投石机为阅兵式开辟道路。
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2. The engineer designed a pitch paver that could deliver heavy stones up to 50 meters away.
工程师设计了一种投石机，能够将重达50米远的石头投掷出去。
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3. The pitch paver was an essential part of the ancient city's defense system.
投石机是古代城市防御系统的重要组成部分。