thefindingsabovesuggestthatthehumanbrainwasalreadyasymmetricalinitsstructureandfunctionnotlongafter2millionyearsago.这里的,notlongafter2millionyearsagoNotlong在这里有什么作用然后,after2millionyearsago

Question

the findings above suggest that the human brain was already asymmetrical in its structure and function not long after 2 million years ago.
这里的,not long after 2 million years ago Not long 在这里有什么作用
然后,after 2 million years ago 该如何划分?after (2 million years ago),

Answer 1

not long after 是不久的意思
可以引导从句或加Ving
如
Not long after I switched, I got a tempting offer in the mail from T-Mobile
Not long after composing my letter to Glinda, I visited a dying friend I'll call Sue.
Not long after that I left Jerusalem, but not before I visited Yair again.
这句话的意思是：以上研究结果表明人类的大脑已经不对称的结构和功能在200万年前后不久.（这句话是不是少了些啥）