started at 9.4 calendar yr BP and ended at 4500 calendar yr BP
开始于距今9.4个自然年,结束于距今4500自然年．
calendar yr BP=calendar year before present,意思与BC相同
from 4200 to 4300 14C yr BP
用碳14检测距今4200到4300年（）
时间检测方法除了用日历推算,我们还可能通过碳14的检测得到相对具体的年限．
一句英语关于时间的求翻译started at 9.4 calendar yr BP and ended at 4500
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