把这一句，留给此刻的你
But it really wasn't until three to four years later, when we had an opportunity in the lab to make very detailed observations, and comparisons with other fossil discoveries, that we realized she was a new species of human ancestor.
但直到三到四年后，当我们有机会在实验室进行非常详细的观察，并与其他化石发现进行比较时，我们才意识到她是人类祖先的一个新物种。