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.
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。
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