n. a bag carried by a strap on your back or shoulder
v. hike with a backpack
n. 远足用的背包；双肩背包, 背包
1. I always carry my backpack to school every day.
我每天都带着书包去学校。
2. She packed her backpack with snacks and water for the hike.
她为徒步旅行准备了装满零食和水的背包。
3. His backpack is too heavy because it is filled with books.
他的背包太重了，因为里面装满了书。