It involved Pullman turning ten Jackscrews.

2015年高考英语湖南卷 阅读理解 阅读B 选项

One man was assigned to operate each section of roughly 10 Jackscrews.

2015年高考英语湖南卷 阅读理解 阅读B 原文

To lift a big structure like the tremont hotel, pullman would place thousands of Jackscrews beneath the building's foundation.

2015年高考英语湖南卷 阅读理解 阅读B 原文