动词
中文翻译：预下底
同义词：
['prepour', 'prelay']
例句：
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1.The engineer needs to prebottom the foundation before starting work.
工程师需要在开始工作之前预铺地基。
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2. The construction crew was prebottoming the scaffolding for the new building.
建筑工人正在为新建筑预铺脚手架。
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3. Before the race, the runners were prebottoming their shoes to ensure a smooth run.
赛跑前，运动员们预铺鞋底以确保顺利起跑。