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。
Geologists have devised a special geological time scale in reference to the earth's evolution.
地质学家们根据地球的演化历史，设计出一种特殊的地质年代表。
Geologists have devised a special geological time scale in reference to the earth's evolution.
地质学家们根据地球的演化历史，设计出一种特殊的地质年代表。
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