名词
中文翻译：垂直式心轴
同义词：
['vertical rod', 'vertical shaft例句：1. The engineer used a vertical mandrel to drill through the concrete.（工程师使用一根垂直的心轴来钻透混凝土。）']
例句：
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1. The engineer used a vertical mandrel to drill through the concrete.
工程师使用一根垂直的心轴来钻透混凝土。
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2.The vertical mandrel was essential for the construction of the tower.
垂直心轴对于建造这座塔来说是必不可少的。
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3.The mandrel was used to guide the drilling process and ensure accuracy.
心轴被用来引导钻孔过程，确保准确性。