榆树

Then one year, agricultural catastrophe struck Michigan in the form of Dutch Elm Disease.

后来有一年，荷兰榆树病袭击了密西根州，造成了农业的大灾难。

Of the fungus causing Dutch elm disease.

能引发荷兰榆树疾病的菌类的一种携带体。

Then one year, agricultural catastrophe struck Michigan in the form of Dutch Elm Disease. It left a path of death across vast areas.

之后有一年，荷兰榆树病袭击了密歇根州，造成了一场严重的农业灾难，在广袤的原野上留下了一条死亡之路。

A vector of the fungus causing Dutch elm disease .

能引发荷兰榆树疾病的菌类的一种携带体。

Portland maintains at least 20,000 trees today, including about a hundred elm trees that survived a 1960s outbreak of Dutch Elm disease.

波特兰保持至少20000树木今天，其中包括大约一百种榆树成活树木20世纪60年代爆发一－荷兰榆树病。

Portland maintains at least 20,000 trees today, including about a hundred elm trees that survived a 1960s outbreak of Dutch Elm disease.

今天波特兰市维修至少有20000棵，其中包括大约100棵榆树的生存因为20世纪60年代曾经爆发荷兰榆树病。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。