求翻译：采用便利抽样的方法，对我校大一、大二、大三、大四的在校女大学生进行问卷调查，了解她们的痛经状况及平时饮食习惯、痛经的缓解办法等。是什么意思？

The use of convenience sampling method, our school freshman, sophomore, junior and senior female students in the school conducted a questionnaire survey, to understand their situation and the usual eating habits dysmenorrhea, dysmenorrhea and other mitigation measures.

Using convenience sampling method to me, and a large school, Big 2, Big 3, Big 4 female college students at the school and learn about their pain in the questionnaire survey by the condition and usually eating habits, such as the mitigation options.

Uses convenience sampling the method, to my school big one, big two, big three, big four carries on the questionnaire survey in the school female university student, understands their painful menstruation condition and usually the diet custom, the painful menstruation alleviation means and so on.

Used to facilitate sampling methods, our college freshman and sophomore, junior, and senior school conducted a questionnaire survey of female college students, aware of their condition of dysmenorrhea and mitigation options of normal eating habits, dysmenorrhea, and so on.

正在翻译，请等待...