人类在地质年代表中已经存在，但时间不长。
On the geological time scale mankind has existed but for a brief moment.
这部分地质年代表还没有令人满意地再细分出来。
This part of geologic calendar has not been satisfactorily subdivided.
科学家正讨论是否应正式把这个时期列入地质年代表。
Scientists are now debating whether it should be officially included in the Geological Time Scale.
银河年是建立理想地质年代表的基础，每一个银河年就是一个代。
Hence it is considered that a galactic year can be based on to institute an ideal geologic time scale in which a galactic year is an era.
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.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
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