Grammar Note
可数名词，常与 in 搭配表示‘装在背包里’
背包；行囊
先理解核心含义，再看它在真实句子里的用法。
背包；行囊
a bag carried by a strap on your back or shoulder
He packed his knapsack with food and water for the hike.
他背包里装满了徒步旅行用的食物和水。
一组可从中选择子集的值。
A set of values from which a subset is chosen.
一种背在背部或肩上的带子包
a bag carried by a strap on your back or shoulder
The old knapsack was frayed from years of use.
这个旧背包因多年使用而磨损了。
She slung her knapsack over one shoulder and set off.
她把背包挎在肩上，出发了。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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可数名词，常与 in 搭配表示‘装在背包里’
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.