几秒钟的警报也能够挽救建筑地盘上的生命，例如让工人抓住钢梁或者把起重机移到较安全的位置。
A few seconds' warning could also save lives on construction sites, allowing, for example, workers to grip girders or move cranes to safer positions.
起重机将几根钢梁吊上了房顶。
The crane lifted some steel beams to the top of the structure.
起重机将几根钢梁吊上了房顶。
The crane lifted some steel beams to the top of the structure.
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