中国人搞黑火药当然用于军事。无奈中国古代建筑落后，都是土夯城墙，不需要太高端的火药。一直到明代，才开始用砖墙，这个时候开始进口西方的大炮。
像君士坦丁堡，靠城墙守了一千年，直到大炮出现。
像君士坦丁堡，靠城墙守了一千年，直到大炮出现。
技术进步无可阻挡，竞争激烈的时代，技术一般优先用于军事，
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古代中国基本上没有科学，有的是经验的积累。
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耶书仑
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https://www.quora.com/Is-Obama-lying-when-he-says-the-US-welcomes-the-rise-of-China
Every time I've heard President Obama say it, he has said something more specific, to the effect of this: he welcomes the rise of a "peaceful and prosperous China, open to the world." This echoes a frequent direct quote from Chinese officials describing how they hope to be seen by the rest of the world.
For economic reasons, many Americans and American companies stand to gain immensely from China's rise as a consumer society (that is, if China is both prosperous and open to the world) by selling luxury goods, by providing high-tech goods and equipment and expertise which China can't make by itself, by catering to Chinese tourists abroad, etc.
On the "peaceful" side, I'm sure that Obama would differ with his definition of this term from China's leaders, though both benefit politically from the rhetorical ambiguity of the word. The USA, as well as many of China's neighbors, would clearly prefer China to be more cooperative and less adversarial in its dealings with other countries in the region in countless ways (fishing rights disputes, maritime border disputes, trade agreements, cyber warfare, One China policy, etc etc).
Every time I've heard President Obama say it, he has said something more specific, to the effect of this: he welcomes the rise of a "peaceful and prosperous China, open to the world." This echoes a frequent direct quote from Chinese officials describing how they hope to be seen by the rest of the world.
For economic reasons, many Americans and American companies stand to gain immensely from China's rise as a consumer society (that is, if China is both prosperous and open to the world) by selling luxury goods, by providing high-tech goods and equipment and expertise which China can't make by itself, by catering to Chinese tourists abroad, etc.
On the "peaceful" side, I'm sure that Obama would differ with his definition of this term from China's leaders, though both benefit politically from the rhetorical ambiguity of the word. The USA, as well as many of China's neighbors, would clearly prefer China to be more cooperative and less adversarial in its dealings with other countries in the region in countless ways (fishing rights disputes, maritime border disputes, trade agreements, cyber warfare, One China policy, etc etc).
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