寫作思路：從文章的寫作目的、中心主旨入手，以使文章中心思想鮮明、深刻地表現出來，正文：
How to prevent the flu
如何預防流感
These days,many people become sick,especially have the flu.Every year,when the season changes,the flu spreads quickly.But how to prevent the flu?And what should we do then?
這些天，許多人生病了，尤其是流感。每年，當季節變化時，流感會迅速傳播。但是如何預防流感呢？那我們該怎麽辦？
First,we must do enough exercise everyday.We may play sports ,such as walking,running,doing morning exercises,playing ball games,and so on.Doing sports can help build up our bodies.
首先，我們必須每天做足夠的鍛煉。我們可以做運動，比如散步、跑步、做早操、玩球類運動等等。做運動可以幫助我們強身健體。
Second,we'd better keep our rooms clean and the air around us fresh.We should often tidy our rooms and sweep or mop the floor.And we must often open the windows and let the fresh air in.
第二，我們最好保持房間幹凈，周圍的空氣新鮮。我們應該經常整理房間，掃地或拖地。我們必須經常打開窗戶，讓新鮮空氣進來。
Third,we should often wash our hands with the move water,if permitted.And we'd better have a bath as often as possible.Of course,we have to often change our clothes,too.In this way,the germs can't come into the body through the skin.
第三，如果允許，我們應該經常用流動的水洗手。我們最好盡可能經常洗澡。當然，我們也要經常換衣服。這樣，細菌就不能通過皮膚進入體內。
Fourth,we'd better keep away from the crowded places,such as the hospital,the big supermarket,business center and so on,Because the air there isn't fresh enough.We may easily catch all kinds of infections there.
第四，我們最好遠離擁擠的地方，如醫院、大超市、商業中心等，因為那裏的空氣不夠新鮮。我們在那裏很容易感染各種傳染病。
Next,we have to drink enough water every day.At this time of year,the air is always quite dry.There's little rain and it blows strongly.Many people feel thirsty easily.So we'd better drink 1500milliliter water every day,or we'll get xick in different ways.
接下來，我們必須每天喝足夠的水。每年的這個時候，空氣總是很幹燥。很少下雨，而且風很大。很多人很容易口渴。所以我們最好每天喝1500毫升的水，否則我們會以不同的方式中毒。
Finally,it's better to go to bed early and get up early.There's a famous saying which says:"Early to bed and early to rise makes you healthy,wealthy and wise."Having enough sleep can help make us keep healthy.
最後，還是早睡早起比較好。有壹句名言說:“早睡早起使妳健康、富有和聰明。”
Good health is more important than wealth.Hope you keep healthy every day!
充足的睡眠可以幫助我們保持健康。
健康比財富更重要。希望妳每天都保持健康！