嗅觉系统中提供了大脑与外部环境的直接联系，嗅觉的脑通路可能成为CNS药物直接进入脑的一条新的途径。
As the olfactory system provides a direct pathway through inner brain to outer, the olfactory-to-brain pathway may be a new way for the CNS medicines' entry into the inner brain.
目前甲基叔丁基醚（MTBE）被广泛用作汽油添加剂，通过各种排放途径进入环境的数量不断增加。
Methyl tert-butyl ether(MTBE)is widely used as reformulated gasoline oxygenate. It is so much used that the amount of MTBE discharged into the environment is increasing continuously.
为控制虫害农业上大量使用硫丹，因此硫丹可通过多种途径进入水环境中。
Endosulfan has been discovered in aquaculture environment and aquatic products, which was massively used in agriculture.
为控制虫害农业上大量使用硫丹，因此硫丹可通过多种途径进入水环境中。
Endosulfan has been discovered in aquaculture environment and aquatic products, which was massively used in agriculture.
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