The tropic chain in modern cities has long been severed, and organic fertilizers, once cherished by peasants, have become urban disasters, polluting our rivers and lakes.

完整的营养链在当代城市生活中早已被切断，被农民当作宝贝的有机肥料，而今变成了一种城市灾害，对河流湖泊造成了污染。

youdao

The theory starts from the analysis on characteristics of urban disasters and considers that urban managers should pay enough attention to Secondary disasters and derivatives disasters.

该论文从分析城市灾害的特性入手，认为城市管理者应该对次生灾害及衍生灾害引起足够的重视。

youdao

A key focus of the World Health Day campaign is to make urban areas resilient to emergencies and disasters.

本次世界卫生日活动的重点是增强城市抵御突发事件和灾难的能力。

youdao

The objective of World Water Day 2011 is to focus international attention on the impact of rapid urban population growth, industrialization and uncertainties caused by climate change, conflicts and natural disasters on urban water systems.

UNESCO: World Water Assessment Programme (WWAP)

During this session, water management under conditions of uncertainty and risk will be addressed through different perspectives - including water for urban settlements, valuation, pollution and disasters and the need for accurate information - with proper links to sustainable development.

UNESCO: World Water Assessment Programme (WWAP)

Population density not only increased the vulnerability of urban centres but magnified the impact of natural disasters, delegates heard.

BBC: NEWS | Science/Nature | Losing sight of the countryside