介绍了换热设备污垢的定义、分类和普遍性，分析了污垢的危害，估算了由污垢造成的经济损失。
The definition, classification and popularity of heat exchanger fouling was introduced, the harm of fouling was analyzed, and the economic loss caused by fouling was also estimated in the paper.
登革病毒感染造成的症状由轻微登革热，乃至于可能会致死的登革出血热或登革休克症状。
Dengue virus (DV) infection causes diseases ranging from mild dengue fever to life-threatening dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS).
登革病毒感染造成的症状由轻微登革热，乃至于可能会致死的登革出血热或登革休克症状。
Dengue virus (DV) infection causes diseases ranging from mild dengue fever to life-threatening dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS).
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