1.Referringtoaninvestigation,itisacommonphenomenonthatstudentsareweak,myopicandeasytofaint.
2.Societydeveloping,thepressureonthemincreasing,classesmoreandlastinglonger,thestudentsstayinguplatedoinghomeworkmorefrequently,remarkablydecreaseoftheirhealthisnothingnew.(你说不要简单句式，我就用一大堆独立主格结构）
3.Forthepurposeoftheadvancementofthehealthlevelofstudents,Irecommendthattheyincreasetheirparticipationinsportsafterschool.
4.Themainideaofthearticleisthatpeoplearesupposedtodophysicalexercisestodecreasetheriskoffallingsick;otherwise,theywillbequitevulnerable.
