where a lot of things gets shipped,

很多东西都不能航运
it's just going to be more expensive to get things to you,

对你来说获得商品会很昂贵
including food.

包括食品
So that becomes an issue.

所以问题来了
The climate is bad for growing food,

气候不利于农作物的生长
but good for fostering disease--certain diseases in particular.

但却有利于某些疾病的滋生
So the climate becomes a good host, a good environment,

所以气候成了个好主人好环境
it becomes rich in opportunity for disease bearing organisms to thrive,

它给疾病提供了在机体中扩散的机会
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