几千年以来，人们已经接受各种领域里的挑战。不仅有身体方面的挑战，也有社会和智力方面的挑战。一些人冒着生命危险参加体育运动去证明他们能做得多好。还有一些应尽力去发明东西使生活更加简单。他们乐意于挑战。
为什么人们乐意于挑战？有许多的理由。一就是好奇心。另外就是成就感。而今天，对于某些人，那是一种工作。今天我们仍然面对许多的挑战。医学面对着攻克许多仍然袭击人类的病魔的挑战。工程师和规划者得建成新的城市，设计和生产新的交通工具，科学家得发展新形式的能源。
总之，我们生活在一个挑战的年代里。
For thouand of year, people have accepted challenge in different field. There are not only phyical challenge, but alo ocial and intellectual challenge. Some people rik their live in playing port to ee how well they can do. Other try to make and invent omething to make life eaier. They all enjoy challenge.
Why do people enjoy thee challenge? There are probably many reaon. One i curioity. The other i the peronal feeling of ucce, of achievement. And nowaday, for ome people, it i a buine.
Today we till have many challenge before u. Medical cience face the challenge of conquering many dieae which till attack human being. Engineer and planner mut build new citie and deign and produce new kind of tranportation. Scientit mut develop new form of energy.[由Www.haozuowen.com整理]
In hort, we live in an age of challenge.