在北美和欧洲，像荷兰榆树病这样的真菌疾病已经杀死了数百万棵曾给森林和城市增光添彩的高大树木。
In both North America and Europe, fungus-causing diseases such as Dutch elm disease have killed off millions of stately trees that once gave beauty to forests and cities.
输出的信号被调整至与杨柳树的尖叫声一样的音调，我用各种可能来威胁他，从突然掉落的树枝，一直到荷兰榆树病，什么都有。
The output was adjusted to the same pitch as the tree's screams and I threatened him with everything from falling branches to Dutch elm disease.
波特兰一直有森林城市的美称，今天它拥有的树木至少2万棵，其中包括约100榆树，它们历经20世纪60年代爆发的荷兰榆树病而幸存下来。
Long called the forest City,? Portland maintains at least 20, 000 trees today, including about a hundred elm trees that survived a 1960s outbreak of Dutch elm disease.
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