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1·Could you tell me the main causal agents of plant diseases?

你给我讲讲植物病害的主要病原，好吗？

2·We believe that these intentional agents control the world, sometimes invisibly from the top down (as opposed to bottom-up causal randomness).

我们相信这些有意图的实体控制着世界，等级森严但却无法得见(与因为自下而上所以随机变化的情况正相反)。