本刊警告说，上一次的互联网泡沫和美国房地产泡沫在破裂之前存在很久了。
This paper warned about both the last Internet bubble and the American property bubble long before they burst.
事实上它应该存在很久了，不过天文学家们一直只能观测到距离太阳第七近的恒星系统。
It's actually been there all along, but astronomers have only now spotted what could be the seventh closest star system to the sun.
RSS已经存在很久了，有许多版本；atom的出现要近的多而且也有更多的特性。
RSS has been around longer, in various versions; Atom is more recent but has more features.
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