People travelling long distances frequently have to decide whether they would prefer to go by land, sea, or air. Hardly anyone can positively enjoy sitting in a train for more than a few hours. Train compartments soon get cramped and stuffy. It is almost impossible to take your mind off the journey. Reading is only a partial solution, for the monotonous rhythm of the wheels clicking on the rails soon lulls you to sleep. During the day, sleep comes in snatches. At night, when you really wish to go to sleep, you rarely manage to do so. If you are lucky enough to get a sleeper, you spend half the night staring at the small blue light in the ceiling, or fumbling to find you ticket for inspection. Inevitably you arrive at your destination almost exhausted. Long car journeys are even less pleasant, for it is quite impossible even to read. On motorways you can, at least, travel fairly safely at high speeds, but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic. By comparison, ferry trips or cruises offer a great variety of civilized comforts. You can stretch your legs on the spacious decks, play games, meet interesting people and enjoy good food -- always assuming, of course, that the sea is calm. If it is not, and you are likely to get seasick, no form of transport could be worse. Even if you travel in ideal weather, sea journeys take a long time. Relatively few people are prepared to sacrifice holiday time for the pleasure of travlling by sea.
Aeroplanes have the reputation of being dangerous and even hardened travellers are intimidated by them. They also have the disadvantage of being an expensive form of transport. But nothing can match them for speed and comfort. Travelling at a height of 30,000 feet, far above the clouds, and at over 500 miles an hour is an exhilarating experience. You do not have to devise ways of taking your mind off the journey, for an aeroplane gets you to your destination rapidly. For a few hours, you settle back in a deep armchair to enjoy the flight. The real escapist can watch a film and sip champagne on some services. But even when such refinements are not available, there is plenty to keep you occupied. An aeroplane offers you an unusual and breathtaking view of the world. You soar effortlessly over high mountains and deep valleys. You really see the shape of the land. If the landscape is hidden from view, you can enjoy the extraordinary sight of unbroken cloud plains that stretch out for miles before you, while the sun shines brilliantly in a clear sky. The journey is so smooth that there is nothing to prevent you from reading or sleeping. However you decide to spend your time, one thing is certain: you will arrive at your destination fresh and uncrumpled. You will not have to spend the next few days recovering from a long and arduous journey.
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1.Hardly anyone can positively enjoy sitting in a train for more than a few hours.
e.g. The waitress was positively rude to us. (positively用于强调rude. It means she was completely rude to us. )
e.g. He said quite positively that he would come.(positively=certainly, or definitely)
e.g. The teacher spoke positively about the work he had done. (positively=favorably)
2, ... but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic.
More often than not意为经常（very frequently）
e.g. More often than not she makes the same mistake.她常常犯同样的错误。
3，By comparison, ferry trips or cruises offer a great variety of civilized comforts.
By comparison意为相比之下，相形之下，等同于in comparison。
e.g. The old method suffers by comparison.老方法相形见拙。
在点明与之比较的事物时，一般用in comparison with,例如：
Your conclusion is wrong in comparison with their conclusion.你们的结论与他们的相比是错误的。
4，If it is not, and you are likely to get seasick, no form of transport could be worse.
if it is not后面省略了calm
be likely to意为有可能
e.g. He is not likely to come.他不见得会来。
e.g. If you don't make anything wrong, and you need have no blame.如果你没做错事，那么你不必自责。
No form of transport could be worse (than it) 为带有否定词的比较级表示最高级。
5，But nothing can match them for speed and comfort.
Match意为与......相匹敌（be equal to）
e.g. No one can match him in singing.
For此处意为"就......而言",相当于as far as.....be concerned.
6, Travelling at a height of 30,000 feet, far above the clouds, and at over 500 miles an hour is an exhilarating experience.
句中at a height of 30,ooo feet和at over 500 miles an hour为两个并列的介词短语作状语，修饰动名词主语travelling，并与其一同构成动名词短语，在句子中作主语。
文中far above the clouds作插入语，对at a height of 30,000 feet作补充说明。
7，However you decide to spend your time, one thing is certain: you will arrive at your destination fresh and uncrumpled.
fresh and uncrumpled意为"精神焕发，毫无倦意"
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