因此，很难获知究竟是某项疗程真正发生作用还是自然衰退导致的结果。
So it is difficult to know if a certain treatment actually works or was simply taken during a naturally occurring remission.
这个发现还是很耐人寻味的，至今记忆的自然衰退过程依旧笼罩在神秘之中。
But the finding is intriguing because the natural process of memory decay remains shrouded in mystery.
荧光假单胞杆菌2P2 4菌株分离自小麦全蚀病自然衰退土壤，可产生多种次生抗菌物质，对一些作物土传病害具有较好的防治能力。
Pseudomonasfluorescens 2P24, a biocontrol agent for soil_borne diseases has been isolated from the wheat take_all decline soil, and was characterized with efficient production of antifungal compounds.
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