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how they got on with each other他们之间相处又是如何改变进化历程的
get on with取得进展； 与 ... 友好相处； 继续做
Do you get on with your parents?
你和父母合得来吗?
To find the answer, we need to go back four million years想解开这一谜团就要回到400万年以前
go back回去
I may be going back in the fall.
我可能在秋天回去。
He is now fit enough to go back to work.
他现在身体健康，可以回去工作了。
surviving on a diet of raw fruit and vegetables.单靠生鲜蔬果为生
survive on靠 ... 活下来； 靠 ... 生存
These players have to survive on their wiles.
这些运动员得靠诡计才能不被淘汰。
They can survive on very little money.
他们用很少的钱就可以生存。
