在研究这些疾病爆发的过程中，科学家们发现受影响的树木会向树叶中释放以酚类物质为主的有毒化学物质进行反击。
In studying these outbreaks, scientists have discovered that affected trees fight back by releasing toxic chemicals, mainly phenols, into their foliage.
在研究这些疾病爆发的过程中，科学家们发现受影响的树木会向树叶中释放以酚类物质为主的有毒化学物质进行反击。
In studying these outbreaks, scientists have discovered that affected trees fight back by releasing toxic chemicals, mainly phenols, into their foliage.
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