这样就在理论上形成了全球性的免疫系统，但是如果有一个人走了出来，病菌就会马上散播开来。
Global quarantine would work in theory, but if just one person evaded it the disease would be free to spread again.
对现场的取样分析解释了显著的树冠损失的原因。排水不良地区的粉质粘土壤土和具有代表性的草原环境条件都在现场广为散播。
Forensic analysis of the site explained significant canopy loss. Poorly drained areas with silty clay loam soils - conditions more representative of prairie environments - were widespread on the site.
船舶作业中把排出的氮氧化物、二氧化硫、微粒物质以及危害性的污染一并散播到空气中。
Ship operations emit nitrogen oxides, sulfur dioxide, particulate matter, and hazardous pollutants into the air.
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