Included in the "dull" and the "difficult" categories were surveillance missions requiring time and a degree of persistence that crews of manned aircraft could not provide.
“枯燥”“困难”分类内的任务包括需要时间和相当程度的耐久性的监视任务，这是人工飞行器不能满足的。
Elizabeth Docteur, a health economist, points to evidence in the report suggesting that America (like Britain and Italy) has a high degree of "persistence of earnings" across generations.
健康经济学家伊丽莎白·多科特(ElizabethDocteur)从报告中指出，美国(正如英国和意大利一样)，几代人都保持着稳定的高收入。
Elizabeth Docteur, a health economist, points to evidence in the report suggesting that America (like Britain and Italy) has a high degree of "persistence of earnings" across generations.
健康经济学家伊丽莎白·多科特(ElizabethDocteur)从报告中指出，美国(正如英国和意大利一样)，几代人都保持着稳定的高收入。
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