It's several hundred years old.(同义句替换) It __ __ several hundred years ago.

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• hundred(thound)到底可数不可数?刚开始我以为除了hundreds of （thousand of)等词组外,就是个不可数名词.因为除此之外没有见过其词尾加s的情况.而且可以被 a few 等只能修饰不可数名词的形容词修饰.如：a few hundred meters.好像还不能用several等修饰可数名词的形容词前缀.但后来又发现它们被many 修饰.还不能用much 来修饰.如：The thing's how many hundred years old?这东西几百年了?nnd 它们到底可不可数?最好能讲讲规律,真神啊请现身吧!到底哪些形容可数的形容词，和不可数的形容词可以修饰它们？
• 英语翻译Most people usually traveled by ship and train which are driven by steam engine.It played an important part in many kinds of vehicles several scores of years ago.Who invented steam engine and what units could be used to measure the power of engine?The word “horse-power” was first used two hundred years ago.James Watt from a worker’s family made the world first widely used steam engine.At first,he couldn’t tell people how powerful it was,because th
• It's several hundred years old.(同义句替换) It __ __ several hundred years ago.
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