这段英文啥意思The key was to use a pulley system that would magnify the applied force.So they rigged up a tent-shaped scaffold directly above the tip of the horizontal column,with pulleys suspended from the scaffolds apex.The idea was that as one end of the column rose,the base would roll across the ground on a trolley.怎么都不看不懂.谁能给我讲讲

这段英文啥意思
The key was to use a pulley system that would magnify the applied force.So they rigged up a tent-shaped scaffold directly above the tip of the horizontal column,with pulleys suspended from the scaffolds apex.The idea was that as one end of the column rose,the base would roll across the ground on a trolley.
怎么都不看不懂.谁能给我讲讲