英语翻译Are you carrying too much on your back at school?You're

英语翻译
Are you carrying too much on your back at school?You're not alone.Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks (schoolbags).
"It hurts my back when I run," said Oberlin Reyes,a student in Virginia."It's hard to get up the stairs with my backpack,because it's too heavy."
Oberlin is among students whose backpacks were weighed for a week in a recent study.
They had regular backpacks with two straps (带子) to carry them,but a number of students with heavy loads had switched to rolling backpacks (which have wheels and can roll on the ground).
Shirley Park,whose backpack weighed 10 kilograms,said she changed to a rolling backpack because she was starting to have back pain.
How much is too much?Experts say students should carry no more than 10 to 15 percent of their own body weight.A few students had one suggestion to lighten the load:less homework.
P.S.(附言) Doctor's suggestion:
① Lighten the load.Clean out binders (活页材料) and take home only the books you need that night.
② Wide straps are better.They send out the weight over your shoulders more evenly (均匀).And be sure to wear both straps rather than hanging the pack over one shoulder.
③ Pack smart.The heavier things should be packed closed to the back.④ Bend both knees when you pick up the pack,and don't just bend over at the waist (腰).

你上学时是否背很多书?这种情况不仅仅发生在你身上.美国背部研究专家担心青少年学生背太多的书会引起背部、颈部问题.
“我走路的时候书包就压得背疼.”弗吉尼亚的一名学生Oberlin Reyes说.“上楼梯时,由于书包太重,很吃力.”
O是最近被调查的为其书包称重为期一周的人之一.
这些学生一律背着有两条带子的书包,但也有很多人已经转向用滚动背包（有轮子并且能在地上滚动）.
到底多种才算超重?专家们指出学生书包的重量不应超过他们体重的10%至15%.有些学生建议减轻家庭作业来减轻他们的负担.
PS:医生的建议
1.减轻重量.不带活页材料,只带当晚需要的书本回家.
2.加宽书包带的宽度.这样能把书包的重量均匀的分不到肩膀上；一定要把背带分别背在两个肩膀,不能背在同一个肩膀上.
3.背包的诀窍.较重的东西要紧挨着背.
4.提起背包时要曲两膝,不要只弯腰.