For many years in the desert, camels used to be the only from of transportation.
Before the age of modern trains, camel trains used to carry all the goods
for trading between Central Africa and Europe. Traders sometimes used to
put together camel trains with 10,000 to 15,000 animals. Each animal often
used to carry as much as 400 pounds and it could travel twenty miles a
day. This from of transportation used to be so important that camels were
called the “Ships of the desert.”
Now modern trains travel across the desert in a very short time. One engine
can pull as much weight as 135,000 camels. In addition, trains use special
cars（车厢） for their load. Refrigerator cars carry food; boxcars carry
heavy goods; stock（家畜） cars carry animals; and tank cars carry oil.
Air travel is also a modern means of transportation, but it has changed
since the early twentieth century. The earliest planes were biplanes were
biplanes（双翼飞机）, with two sets of wings. The top speed of this plane
was 60 miles per hour. The pilots used to sit or lie on the wings in the
open air. The plane engines sometimes used to stop in the middle of a trip.
It used to be impossible to fly in bad weather. In snow or in rain, the
wings frequently used to become icy. Then the plane might to down.
Mechanical improvements during the first world war changed airplanes. Monoplanes（单翼飞机）
took the place of biplanes. Pilots flew inside of covered cabins（机舱）.
Still, even these planes were small. Only rich people used to be able to
travel in air planes.
Now modern jets（喷气式飞机） make air travel possible for all people.
No place in the would is more than 24 hours away by jet. Further improvements
have lowered the cost of flying, and they have made air travel much safer
than it used to be. People never used to eat, sleep, or watch movies on
airplanes. Now these things are a usual part of air travel.
1． used to 表达过去经常发生的、现在已经中止的了行为，如：
He used to smoke, but he has given it up.（他以前吸烟，现在已经戒了。）
注意be used to +V(……被使用以……)和be used to +N（习惯于）这两个动词词组用法和意义上的区别。
Rice can be used to make wine.
He is used to living in Shanghai.
2． Goods 指“货物”。
3． Twenty miles a day意为“一天20英里”，a day 与per day 通用。
4． So …that引导结果状语从句，如：
Modern jets fly so fast that they can reach any city within 24 hours.
I have written 3,000 words since 8 o'clock in the morning.
He has collected lots of data since the investigation was started.
7． 意为“露天”。另一种说法是in the open。
8． go down一般的意思是“下来，下降”。如：The price went down yesterday.但在本文中的意思是“下坠”。
10．“make +N+ possible”意为“使得……成为可能。”
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