长期共存的思想已经存在很久了。
The idea of long-term coexistence had been there for a long time.
古老的；久远的：古老的，存在很久的。
金属和石头能存在很久。
地球会存在很久很久，也总会有合适的生物活下去。
Through the long lifetime of the earth, some suitable creatures do survive.
错误的事实对科学进步危害极大，因为这些事实往往会持续存在很久；
False facts are highly injurious to the progress of science, for they often endure long;
科学家们认为很久以前在那个行星上可能有水存在。
Scientists think there was probably water on the planet long ago.
因此，如果它曾经在地球上存在过，那么它在很久以前就应该衰变了。
Therefore, if that ever had been present on Earth, it would have decayed ages ago.
很久以来日本社会存在的问题就是日本家庭十分不愿意花钱。
Japan's problem has long been that its households are unwilling to spend.
很久以前就已经存在，我们也分享了许多动物，甚至蜥蜴。
That evolved so long ago we share it with many creatures, even lizards.
一个人的存在往往在消失很久以后才体现得出来。
A person's existence is often disappeared after a long time to come out.
恐龙是很久以前生存在地球上的巨型动物。
The dinosaurs were enormous animals which lived on the earth long ago.
在我的脑海中，这个梦想已经存在了很久。以至于任何一个生活在阳光下的人都能用永远拥有一个美好快乐的生活。
I have kept the dream in my mind for so long that whoever in the sun is able to live a happy life for ever.
在我的脑海中，这个梦想已经存在了很久。以至于任何一个生活在阳光下的人都能用永远拥有一个美好快乐的生活。
I have kept the dream in my mind for so long that whoever in the sun is able to live a happy life for ever.
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