她只靠牛奶生存。
Dinosaurs actually existed on earth once.
恐龙确实曾经存在于地球上。
Its main goal is to determine if life ever existed on Mars.
它的主要目标是确定火星是否存在过生命。
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。
The human being at that point already existed on earth as a biological life form.
这个人类实体在那点已经作为一个生物形式的生命存在了地球上。
But financial excesses existed centuries before a brick had been laid on Wall Street.
但是金融过度在华尔街没有一砖一瓦的时候就已经存在了世纪有余。
The subject promise of a theory is based on the issues existed in that theory.
一个理论的本体论承诺就是按照那个理论有什么东西存在的问题。
There existed different opinions on this problem.
对这个问题曾有不同看法。
On the geological time scale mankind has existed but for a brief moment.
人类在地质年代表中已经存在，但时间不长。
The second part researches on the current situation and problems existed.
第二部分探究了现行大规模考试安全面临的形势和存在的问题。
The second part researches on the current situation and problems existed.
第二部分探究了现行大规模考试安全面临的形势和存在的问题。
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