大约93%的美国居民对麻疹是免疫的，他们要么因为接种过疫苗，要么就是小时候得过麻疹。
About 93 percent of U.S. residents are immune to measles either because they were vaccinated or they had the disease as a child.
他们要么因为弹射高度太低，降落伞没打开就已经坠地，要么就和飞机一道坠毁。
They either ejected at too low an altitude, hitting the ground before their parachutes could open, or they went down with their planes.
他们要么因为弹射高度太低，降落伞没打开就已经坠地，要么就和飞机一道坠毁。
They eitherejected at too low an altitude, hitting the ground before theirparachutes could open, or they went down with their planes.
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