= rucksack
a piece of equipment designed to be carried on the back while in use
Each astronaut carries an oxygen backpack for lunar exploration
| 单词 | backpack |
| 释义 | backpack1noun= rucksack a piece of equipment designed to be carried on the back while in use Each astronaut carries an oxygen backpack for lunar exploration backpack2verb intransto travel or hike carrying food, and equipment, or belongings in a backpack backpacker noun |
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