knapsack duster背负式喷粉机;背式撒粉器
knapsack tank囊式泡沫液罐
Trapdoor Knapsack陷门背包
Mountaineering knapsack登山背包
Your Knapsack你的背包
pneumatic knapsack背负式气力喷雾器
knapsack loading背包形式装配
Happy knapsack经营范围
N-COUNT（可数名词） A knapsack is a cloth or leather bag that you carry on your back or over your shoulder, for example when you are walking in the countryside. 背包