existed before
曾经存在
never existed
从未存在
existed long
存在很久
existed here
在这里存在
existed since
自那时起存在
existed only
仅存在
existed together
共同存在
existed previously
以前存在
existed forever
永远存在
existed naturally
自然存在
many ancient civilizations existed long before recorded history.
许多古代文明在有记录的历史之前就已经存在。
there has always existed a strong bond between them.
他们之间一直存在着一种强烈的纽带。
in the past, different species of dinosaurs existed on earth.
在过去，不同种类的恐龙曾在地球上存在。
it is believed that life existed on mars at some point.
人们相信火星上曾在某个时期存在过生命。
a variety of languages have existed throughout human history.
各种语言在整个人类历史中一直存在。
myths and legends have existed in every culture.
神话和传说在每个文化中都存在。
once, a great empire existed in this region.
曾经在这个地区存在过一个伟大的帝国。
evidence shows that intelligent life may have existed elsewhere in the universe.
证据表明，宇宙中可能存在过其他地方的智慧生命。
only a few records of the civilization that existed here remain.
这里曾经存在的文明仅留下了少数记录。
various forms of art have existed since the dawn of humanity.
各种形式的艺术自人类诞生以来就一直存在。
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