Why did they do that? Well, we don't have to do a lot of guessing.

这是为什么呢我们不用瞎猜
We have written evidence from the people who went

这里有移民留下的文字材料
and they say why they did it.

上面写得很清楚
We can then supplement that with all sorts of other information that we have,

再结合其它信息我们就能很好地补充完善
but we don't have any documents

但是对于古希腊我们没有任何的文字资料
from some settler explaining why he's going where he's going.

当时的定居者为什么迁徙就无从知晓了
So, we have to reason from the evidence that the establishment gives us.

所以我们只能从现存的遗迹中寻找线索
I suppose the most widely cited reason

大概最显而易见的原因就是
is simply the desire to acquire farmland.

古希腊人需要更多的土地
Remember, I keep emphasizing this.

我一直在强调
The vast overwhelming majority of people

当时古希腊拥有众多的人口
needed to farm land, in order to stay alive.

人们需要农田才能生存