Among Chinese families with primary and junior high school students, a third of all household educational spending was used for supplemental education in 2017, according to a survey by the China Youth Daily.
《中国青年报》近日进行的一项调查显示，2017年，我国有中小学生的家庭中，用于校外的教育支出占全部家庭教育支出的1/3。

Supplemental education refers to educational products or services purchased from institutions or individuals other than schools for the purpose of developing a student's interest or improving the student's grades in school.
校外教育是指为培养学生的兴趣或提高其在校内的成绩，而从校外机构或个人那里购买的教育产品或服务。

In urban households, supplemental education accounted for 42.2% of the households' total education spending in 2017, while the figure was 16.6% in rural households.
去年在城镇家庭中，校外教育在家庭总教育支出的占比达42.2%，该数字在农村家庭中为16.6%。

According to the survey, 47.2% of all primary and junior high school students received supplemental education in 2017, with an average cost of around 5,616 yuan per student.
该调查显示，在所有中小学生中，有47.2%接受了校外教育，每个学生的平均花销约为5616元。

The country's supplemental education industry is estimated to have exceeded 458 billion yuan in 2017.
据估计，我国的校外教育产业总体规模在2017年已经超过了4580亿元。

The survey was conducted among 40,011 households in 29 provincial-level regions across China.
该调查是对全国29个省份的4011户家庭进行的。