Iran 伊朗
伊朗有很好的地理位置。北通里海，南临印度洋，几乎把中亚分割成一半，东西不相通。丝绸之路不通过伊朗，根本无法进入东亚和南亚，除非绕道从俄国走。伊朗产油。以前伊朗的宗教是拜火教，在里海一带十分盛行。据说，由印度人建立的拜火教，是因为他们看见里海边上国家，由于地底下冒出天然气，遇见空气而大片燃烧，常年不衰，所以把火作为神圣的东西，所以产生了拜火教。伊朗有长久的历史，古老的文明。波斯人是很好的工程师。大流士打仗，攻佔当时君士坦丁堡，在黑海波涛汹涌的海峡把船一字排开。这需要很好的数学计算，算准海流的强度和速度，才能够把船合拢，才可以在上面走大部队车马！

Iran has a good geographical location. Caspian Sea in the north,  Indian Ocean in the south, it almost divides Central Asia Silk Road networks into half, no connection between the east and the west. The Silk Road did not pass through Iran and could not enter East and South Asia at all , unless it took a detour through Russia. Iran produces oil. The religion of Iran used to be Zoroastrianism, which was prevalent in the Caspian Sea. It is said that Zoroastrianism was founded by Indians because they saw countries on the edge of the Caspian Sea burning large areas.  Because of the emergence of natural gas from the ground and encountering air, so they regarded fire as a sacred thing and thus gave birth to Zoroastrianism. Iran has a long history, an ancient civilization. Persians are good engineers. When Darius fought, tried to conquer Constantinople, and he lined up the ships in the rough channel of the Black Sea. This requires very good mathematics calculation, calculate the intensity of current and speed, then can arrange ships into bridges, can walk big army carts and horses on it! 

https://en.m.wikipedia.org/wiki/History_of_Iran

 

https://en.m.wikipedia.org/wiki/Persian_art

https://youtu.be/DfosAf6NGkk

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https://youtu.be/9YSn9Xc67Uk

https://www.youtube.com/playlist?list=PLe5yRvH7hR_JRnDPvD56A0dv4f8402RB5