may have coincided with the time that modern humans had come about.可能就是現代人類文明出現的那一刻
coincide with符合; 與 ... 一致
Her arrival coincided with our departure.
她來到時我們正好離開。
His comments coincided with a survey this week.
他的意見與本周的一項調查結果一致。
we were able to manipulate our mouths to form complex sounds.我們能夠控制自己的嘴巴發出復雜的聲音
able to 能做 ...
He was able to cast off such an uninteresting task.
他終于擺脫了這么一項乏味的工作。
You are better able to do it than I (am).
你比我更有能力做這件事。