外部因素主要是城乡差异与学校文化。
The external factors are mainly the differences of city and countryside and the school culture.
1997年以后，我国城乡差异呈现出扩大趋势。
After 1997, China's urban and rural differences emerged expanding trend.
儿童少年的生长发育表现出明显的性别差异和城乡差异。
Significant differences existed in both the growth and development of boys and girls and in the urban and rural areas.
《苏格兰五岁儿童龋齿的城乡差异》，凯特·a·列文等，爱丁堡大学。
Urban-rural differences in dental caries of 5-year old children in Scotland.
结果：大学新生心理健康状况存在城乡差异（P<0.05）；
Results: There was the difference of mental health status between freshmen from cities and countryside(P<0.05);
中学生在自我调节学习策略的使用上存在性别、年级和城乡差异。
Third, there are gender, grade, urban and rural difference on the use of SRL strategies.
初中生社会支持在是否独生子女差异和城乡差异只体现在主观支持上。
One child and city differences were existed in subjective support of social support.
研究表明：广西壮族自治区女性休闲体育参与率较低，城乡差异较大。
The results indicate that the rate of womens 'recreational sport in Guangxi was low.
结果表明，福建省乡村男大学生的身体素质水平有了很大的提高，城乡差异逐渐减小；
The study shows that physical quality of the countryside male students has been greatly improved and the difference between city and countryside tends to be slight;
结果表明，体重指数、手指关节畸形、足趾关节畸形、血红蛋白和血糖值，城乡差异有显著性（P＜0．001）；
The analysed data show that the body mass index, joint deformities of hands and feet, blood hemoglobin and blood sugar were of significant difference between the urban and rural elderly (P<0.001).
本文在一简化气象模型的基础上，综合考虑了纬度、水陆分布、地形以及城乡差异等多种因素的影响，并对参数加以确定。
Based on a simple HVAC climate model, considered the effect of latitude, distributing of land and water, terrain and discrepancy on town and village, ascertained the parameter.
我国高龄老年人口中享有社会保障和医疗保障的比例非常低，且城乡差异显著。 医疗费用支出给老人及其家庭带来极大压力，构成了高龄老人生活质量下降的重要原因。
Medical expenses have brought heavy pressures both on the oldest old and on their families, and come to be an important cause of the lower life quality.
我国高龄老年人口中享有社会保障和医疗保障的比例非常低，且城乡差异显著。 医疗费用支出给老人及其家庭带来极大压力，构成了高龄老人生活质量下降的重要原因。
Medical expenses have brought heavy pressures both on the oldest old and on their families, and come to be an important cause of the lower life quality.
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