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good hygiene by washing your hands and if you are sick, stay home from work, and keep sick kids home from school, and a respirator also is a good defense against H1N1 flu. Personally, such a lecture is very useful, so I do hope that more lectures like this should be held from time to time in our school in order to prevent diseases.知識材料積累:了解流感癥狀包括: 發(fā)燒/ 頭疼/ 肌肉疼(渾身疼) has been 保持健康的方法 How to stay our health /fit?s health has been greatly affected by air noise and water pollution. Many people died of order to live a better life we need protect our world. I’m talking about / Here is my advice about how to keep health/fit? As a middle shool studentfirst you’d better do more exercise such as playing ball games running swimming