1·An unattended backpack was found in a rubbish pile.
在垃圾桶里发现了一个无人看管的背包。
—— 《柯林斯英汉双解大词典》
2·He staggered a little under the weight of his backpack.
他身上的背包压得他有点步履蹒跚。
—— 《牛津词典》
3·The traditional backpack with a difference—it's waterproof.
这个跟传统背包不同—它防水。
—— 《牛津词典》
4·Mike has a new backpack.
迈克有一个新的背包。
5·Would you put down your backpack?
你能放下你的背包吗?