高积网状云。 “对于所有的观云爱好者来说，能欣赏到这种难以捉摸的云彩无异于恩赐，”当下沉的气团在云层中形成空洞时，网状云便出现了。
Altocumulus lacunosus. “An elusive prize for any cloud collector,” lacunosus clouds form when sinking pockets of air create holes in a cloud layer.
阿拉斯加高架路，作为西雅图的交通动脉，经过2001年地震后被严重损毁，检测者发现一些支撑住下沉了5英尺，并危及到了整体结构。
After an earthquake in 2001 damaged the Alaskan Way Viaduct, a trafficartery in Seattle, inspectors found that some supports had subsided 5 in., weakening the structure.
二〇〇二年，上海的策划者突然大幅减低楼宇建筑的容积率，因为发觉高楼大厦的重量使该市下沉。
In 2002 Shanghai planners abruptly restricted building heights, because they found the city sinking under the weight of real estate.
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