通过对三峡库区水污染严重性的综述，说明水资源总量控制的重要性和综合防治水污染的紧迫性。
The paper describe the serious of water pollution of Three Gorges reservoir area, indicating the importance of gross control and the pressing of synthetic prevention.
分析了飞机腐蚀的严重性和紧迫性，指出了腐蚀检测的重要性。
The hidden corrosion in aircraft is serious and urgent, the importance of corrosion detection is analyzed.
最近，我国和世界各地连续多次严重的空难事件使空防安全的紧迫性显得尤为突出。
The recent serious air disasters in the world make the situation of aviation security more critical.
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