美 [ˈkɔːzl ˈeɪdʒənt]
因果代理：指导致某种结果或事件发生的原因或物质。
any entity that produces an effect or is responsible for events or results
同义词： cause / causal agency
... causal circle 因果循环 causal connection 因果联系 causal agent 致病病原 ...
Holmes crossed two compatible races of ceratocystis ulmi, the causal agent of Dutch elm disease.
霍姆斯曾把荷兰榆病害的致病因子，长喙壳的两个亲和小种杂交。
Xanthomonas oryzae pv. oryzae is the causal agent of rice bacterial blight, a destructive rice disease worldwide.
由水稻黄单胞菌引起的白叶枯病是世界上对水稻生长最具破坏性的病害。
The results are as follows:1. The causal agent was identified as Fusarium proliferatum for the first time in China.
研究结果如下：1、首次明确层出镰刀菌为芒果畸形病病原菌。
But it tested positive for the causal agent for BSE, a protein called a prion, which can arise spontaneously in elderly cattle.
MSN: Saudi Arabia bans Brazil beef imports on mad cow doubts
He recommended banning the sale of nerve tissue such as brains or vertebrae that can contain the disease's causal agent, as Britain did after its bout with the illness.