以下为句子列表：
英文: However, there is often a practical problem with this concept: with a ground clearance of just 50mm and a smooth underbody, the cars often slide over the surface of the gravel trap without braking sufficiently.
中文: 然而，此概念总是会存在着一个实践性的问题：由于离地距离仅为50毫米且底部光滑，赛车总是会滑过沙砾缓冲区的表面，无法及时地刹?
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英文: This dissertation has made a detailed analysis to the work device of the tractor-haulage scraper, built an appropriate mathematics model, and optimized the original digits with genetic algorithm, the result of increasing the ground clearance is achieved.
中文: 摘要对施式铲运机工作装置作了认真分析，建立了恰当的优化数学模型，利用遗传算法对原始数据进行了优化，提高了离地间隙。
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