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Leonardo da Vinci was born on April 15th, 1452 in a northern Italian town. He is considered one of the greatest painters of all time. He is still famous today because of the Mona Lisa and other well-known paintings. However, not many people know he was also an engineer and an inventor.
1452年4月15日，列奥纳多·达·芬奇出生在意大利北部的一个小镇上。他被认为是有史以来最伟大的画家之一。因为《蒙娜丽莎》和其他的著名的画作，直到今天他依然很有名。然而，知道他也是工程师和发明家的人却不多。
Da Vinci was interested in science and art, and he was a pioneer in many areas. He drew plans and pictures and wrote about his many ideas in his diaries. Since he died on May 2nd, 1519, people have been learning from them. They included plans for an adding machine, bridges as well as drawings of musical instruments, flying machines and machines for war, such as guns.
达·芬奇对科学和艺术感兴趣，在很多领域他都是先驱。他绘制设计图，把自己的想法写在了日记里面。自从他于1519年5月2日去世后，人们便从他的日记里面学习知识。日记里面有计算器，桥梁和乐器的草图，还有飞行器和战争的武器，如枪。
Since many of da Vinci's inventions were far ahead of their time, they were only tested hundreds of years later. Because he couldn't test them, not all of da Vinci's plans worked out as well as he wished. However, some of his ideas worked well. For example, one of his bridges was finally built 500 years after it was drawn and flying machines, such as helicopters, are very common now.
由于达芬奇的发明远远超前于时代，直到几百年后这些想法才付诸实践。因为达芬奇不能亲自试验，并非所有的设计图都如他设想般奏效了。然而，他的一些想法成为了现实。例如，在草图画出500年后，他之前设计的一个桥梁终于建成了。像直升机这样的飞行器现在也非常常见。
Some think da Vinci wanted to keep his ideas secret as he wrote his diary in code. Others think it was just easier for him to write this way because he was left-handed. Either way, da Vinci's diaries can only be read with a mirror because everything is written backwards. As it took some time to translate the diaries, they were published more than 150 years after his death.
一些人认为达芬奇想把他的想法保密起来，因为他的日记是用密码写的。其他人则认为，由于达芬奇是用左手写的这样写更容易。无论如何，达芬奇日记只有用一面镜子我们才能看，因为所有内容都是倒着写的。由于需要花费时间翻译，达芬奇的日记直到他去世150多年后才出版。
