My grandfathers farm has become much easier to manage in recent years. His prize Holstein cows , for example , are now milked by automatic pumps rather than by hand. Also , the eggs his hens lay are hatched in incubators instead of by the hens themselves. The temperature and humidity in the hen houses are controlled by thermostats, not by Nature s whim; and the amount of food his chickens get each day is determined by a computer rather than by a farmhands estimates. All that is left for grandfather to go , he jokes, is to sit back and pay the huge electric bills.
六、分类
分类是根据事物的特点分别归类。这样组合段落的目的是为了分清每一种类的性质。例如:
In ferreting the interests of people in space, we are aware that there are probably three reasons. Firstly , it is a plan of looking for other places to hold the overcrowded population on this
earth. Secondly , it is the curiosity of mankind to urge the scientists for the research work, because they desire too eagerly the coming of the day when they can travel freely in space. Thirdly, we are reminded of the mineral sources which are not sufficient to provide for the needs on the earth, so we try every effort to go to other planets in the hope for searching for new resources.
七、一般到个别
大多数的段落以主题句开头,开门见山,点明主题,然后给出具体细节,或是用理由和实例来论证主题。例如:
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