其他古代文明当然也了解风筝的用途；早在公元前1250年，中国人就用它们传递信息，向敌人投掷燃烧的碎片。
Other ancient civilisations certainly knew about kites; as early as 1250 BC, the Chinese were using them to deliver messages and dump flaming debris on their foes.
在历史上，风筝的用途曾有过多次转换。
这节课的重点是制作风筝；风筝是如何制作的，它们的外观和用途。
The focus of this lecture is kite making; how the kites were made, their appearance and the purposes they served.
在古代，风筝曾有着传递信息的军事用途。
In ancient times, kites used to transmit information in military affairs.
在古代，风筝曾有着传递信息的军事用途。
In ancient times, kites used to transmit information in military affairs.
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