Eating lots of high-fiber foods could reduce the risk of breast cancer before middle age.

多吃高纤维食物可以降低中年之前患乳腺癌的风险。

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Other teachers that I went with taught middle-school age students, high-school aged students, and even one class of English teachers and very advanced students.

和我一起在那里教书的其他（外籍）教师则有教初中生的，有高中生的，甚至还给（当地的）英语老师及很高水平的学生上课。

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The researchers followed 5,000 high school seniors until middle age, tracking their body weight and body mass index (BMI) annually for 22 years.

研究人员跟踪调查了5000名高中学生，该调查一直持续直到他们步入中年，总计22年。研究人员每年会记录一次调查对象的体重和体质指数(BMI)。

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Tumblr users range in all age groups and students in high school and even middle school can begin putting together their online resume with ease, thanks to all of the tools available to use with a professionally designed background to pick to accompany the work.

FORBES: Tumblr 101: Join The Reblogging Group

In addition to looking at personal characteristics such as age and relationship status, the researchers divided the countries into high- and middle-to-low income groups according to average household earnings.

CNN: People in affluent nations may be more depression-prone

Mid-nineteenth-century Americans endured a high rate of infant mortality but expected that most individuals who reached young adulthood would survive at least into middle age.

NPR: 'Republic of Suffering' Author Drew Gilpin Faust