It has never existed 它未曾存在
it has existed
它一直存在
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It has existed for just a few years.
它只存在了几年。
youdao
It has existed for thousands of years.
它已经存在了几千年了。
Regarding eternal happiness, I wonder whether it has existed on the earth.
至于永恒的幸福，我怀疑世上是否真正有过。
We all know that. It has never existed.
我们都知道它从不曾存在。
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And it has existed already in other -- through other means, through other communications.
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It has existed as long as there has been a consumer electronics industry.
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It has existed in some businesses (call centers, tech support) for years.
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