N-COUNT A backpack is a bag with straps that go over your shoulders, so that you can carry things on your back when you are walking or climbing. 双肩包
Pack heaviest objects close to the body, and place little ones outside, away from the back.
把最重的东西放在靠近身体的地方，把小的放在外面，远离背部。
The interruption was John Canty--with a peddler's pack on his back--and Hugo.
打岔的是约翰·康第——他背着一个小贩的背包——还有雨果。
The evidence shows that a large number of universities have fallen off the back of the pack, a few perform strongly and the rest chase the leaders.
有证据表明，很多大学已经落后了，有少数学校表现出色，而其余的都在不断追赶领先者。
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