这些经济体都很有各自的特点，因而使得它们易受伤害。
Each of these economies had particular features that made them vulnerable.
农作物，比如：玉米，粮食，小麦和大豆，它们的各种特点已经为人类所熟知，所以才会很有效率地种下去，又很有效率地收回来。
Crops such as corn, rice, wheat and soybeans are all bred to have predictable characteristics so they can be more efficiently planted and harvested by machine.
它们拥有很有趣的特点，例如导热性差(可以做很好的隔热材料)，以及低阻力(意味着表面很滑)。
They often have interesting properties, such as poor heat conductivity (which makes them good insulators) and low friction (which makes them slippery).
它们拥有很有趣的特点，例如导热性差(可以做很好的隔热材料)，以及低阻力(意味着表面很滑)。
They often have interesting properties, such as poor heat conductivity (which makes them good insulators) and low friction (which makes them slippery).
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