将已知的人类打磨石器的最早时间提前了超过150000年
原句还原:
humans are known to have made stone tools at the earliest date
"....." (前面一整句作为一个事实) pushes back the earliest date by more than 150,000 years.
earliest date没修饰谁,一个抽象的时间而已,你也可以替换成具体的例如200BC来理解
-- by 会员 cc621josh (2010/11/28 2:50:34)