but a hard place for food to grow and that becomes a problem.

但在那里农作物很难生长这是个问题
The worst category is the tropical area far from the sea.

最糟糕的就是那些离海很远的热带地区
They talk about how the major grains

他们探讨那些对世界粮食供给
that really help support a lot of the world's food supply

有很大作用的主要农作物
don't grow very well in those kind of environments.

为何在那种环境下无法很好的生存
The yield from corn, for example, or maize

例如小麦或者玉米的产量
is triple in the temperate zones compared to the tropical zone.

温带地区是热带地区的三倍
The high mortality rate has women bearing a lot of children

高死亡率使妇女不得不供养很多孩子
which then creates a strain on the healthcare system

这给医疗系统造成了很大负担
and that further weakens the ability of countries to feed its people.

进而削弱国家喂养人民的能力
So those are problems.

这就是问题的症结
These numbers are really quite remarkable,

这些数字非常值得注意