进一步的研究表明，毛虫对萎蔫病毒几乎具有免疫力，因为它们赖以为生的树木会对越来越多的落叶做出反应。
Further research has shown that caterpillars become virtually immune to the wilt virus as the trees on which they feed respond to increasing defoliation.
鉴于病毒的存在，树木的防御策略显然适得其反。
Given the presence of the virus, the trees' defensive tactic apparently has backfired.
病毒正传播到其他树木。
荷兰莱茵河畔阿尔芬市5年前发现树木出现了无法解释的异常情况，这些异常情况无法用病毒或者病毒感染进行解释，于是下令进行这项研究。
The city of Alphen aan den Rijn ordered the study five years ago after officials found unexplained abnormalities on trees that couldn't be ascribed to a virus or bacterial infection.
荷兰莱茵河畔阿尔芬市5年前发现树木出现了无法解释的异常情况，这些异常情况无法用病毒或者病毒感染进行解释，于是下令进行这项研究。
The city of Alphen aan den Rijn ordered the study five years ago after officials found unexplained abnormalities on trees that couldn't be ascribed to a virus or bacterial infection.
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