Preventing flood is a very important work. In them, underground exploring and permeating wateraccident are tow important work, so we must do them well.
Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.
这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。
3
Steam and water continues to be released through the PORV, creating a LOCA (loss of coolant accident).