n.落水洞(在地面下，雨水长期渗落形成)

The sudden appearance of a sinkhole in the middle of the road caused traffic chaos during rush hour.
翻译：高峰时段路中间突然出现的塌陷造成了交通混乱。
Geologists are studying the sinkhole to understand the underlying geological structure of the area.
翻译：地质学家正在研究这个塌陷坑，以了解该地区的地下地质结构。
The old house was swallowed by a massive sinkhole that opened up overnight.
翻译：一夜之间，一个巨大的塌陷吞噬了那座老房子。
After heavy rains, the neighborhood is always on alert for potential sinkholes due to the unstable ground.
翻译：大雨过后，由于地面不稳，社区总是警惕可能出现的塌陷。
The sinkhole, which measured 50 feet across, was caused by the collapse of an underground cave system.
翻译：这个宽50英尺的塌陷是由地下洞穴系统的坍塌引起的。
Emergency services worked tirelessly to secure the area around the sinkhole and evacuate nearby residents.
翻译：紧急服务部门不辞辛劳地确保塌陷区域的安全并疏散附近居民。
Sinkholes can be natural or caused by human activities like mining or excessive groundwater pumping.
翻译：塌陷可能是自然形成的，也可能是采矿或过度抽取地下水等人类活动造成的。
The discovery of a prehistoric skeleton in a sinkhole provided valuable insights into the region's paleontology.
翻译：在塌陷坑中发现的史前骨骼为该地区的古生物学研究提供了宝贵的信息。
Engineers are using advanced technology to monitor ground stability and predict future sinkhole occurrences.
翻译：工程师们正使用先进技术监测地面稳定性并预测未来的塌陷事件。
The park closed off the walking trail after a sinkhole emerged, ensuring public safety until repairs could be made.
翻译：公园在出现塌陷后关闭了步行道，确保在进行修复之前公众安全。