may have coincided with the time that modern humans had come about.可能就是现代人类文明出现的那一刻

coincide with符合； 与 ... 一致

Her arrival coincided with our departure.

她来到时我们正好离开。

His comments coincided with a survey this week.

他的意见与本周的一项调查结果一致。

we were able to manipulate our mouths to form complex sounds.我们能够控制自己的嘴巴发出复杂的声音

able to 能做 ...

He was able to cast off such an uninteresting task.

他终于摆脱了这么一项乏味的工作。

You are better able to do it than I (am).

你比我更有能力做这件事。