Example 2 (One-side-at-a-time:)
There are three popular forms of transportation when people consider traveling long distances. They are trains, buses and planes. Which form do you prefer? Give reasons to illustrate your choice.
Forms of Transportation
People traveling long distances frequently have to decide whether they would prefer to go by land, sea, or air. Despite the fact most of people choose to travel by train or bus, the most popular forms of transport in China, I like to go by air. (点出要比较的交通工具, 表明自己的选择是飞机)
Hardly anyone can positively enjoy sitting in a train for more than 10 hours.(主题句)Though the price is reasonable, I can’t bear the notorious condition that train compartments often get cramped and stuffy. Reading or talking to your seatmates are only a partial solution, for the monotonous rhythm of the wheels clicking on the rail soon lulls you to sleep.(首先讨论乘火车:其优点是廉价,但缺点是不舒服,时间长)
Long bus journeys are even less pleasant, for it is quite impossible even to read. (主题句) Though you can travel fairly safely at high speeds since highways are built, the greater part of the journey is still spent on the narrow, bumpy roads which are crowded with traffic. Like the train journey, you arrive at your destination almost exhausted. (其次讨论乘长途汽车:其缺点同样是不舒服,耗时间)
Nothing can match airplanes for speed and comfort though they have the reputation of being dangerous (in fact, the accident rate is much lower than traveling by train and bus). For a couple of hours you sit in a deep armchair to enjoy an exhilarating experience: the extraordinary sight of mountains and deep valleys bellow, of unbroken clouds with the sun shining brilliantly above. The journey is so smooth and fast that you arrive at the destination before you know where you are. (最后讨论飞机,其优点是速度快有舒服)
True, airplanes have the grave disadvantages of being the most expensive form of transport. But nothing is precious than time. Not only does the flight take you only a few hours, but you arrive fresh and uncrumpled. You won’t have to spend the next day recovering from a long and arduous journey like traveling by train and bus. (承认飞机出游的缺点是价格昂贵,但通过对时间的看法,进一步说明乘飞机的好处)