名词
中文翻译：卵石填充物
同义词：
['pebble filler', 'pebble padding']
例句：
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1.The boat was filled with pebble ballast to make it more stable.
这艘船用卵石填充物来使其更稳定。
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2. The engineer used a special type of pebble ballast to improve the performance of the machine.
工程师使用一种特殊的卵石填充物来提高机器的性能。
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3.The construction crew carefully removed the pebble ballast from around the foundation before starting work.
施工队在开始工作前小心翼翼地从地基周围移除了卵石填充物。