knapsack
🇺🇸
/ˈnæpsæk/
🇬🇧
/ˈnæpsæk/
noun
R
a small bag worn on the back, used for carrying things.
She packed her books into her knapsack before leaving for school.
她在离开去学校之前，把她的书打包到背包里。
translation
背包
词形变化
Plural
knapsacks