失学，指失去上学机会或中途辍学。
认知能力下降是指丧失学习新技能或回忆单词、名字和面孔的能力，这是随着年龄的增长而最常见的现象。
Cognitive decline is the loss of ability to learn new skills, or recall words, names, and faces that is most common as we age.
然而，少女仍然占失学人口的55%。
Yet, girls still account for 55% of the out-of-school population.
现在在农村，越来越多的孩子失学了。
Now in the country areas, there are more and more children out of school.
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