名词
中文翻译：鸟背
同义词：
['Birdback', 'birdie backpack', 'birdiebag']
例句：
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1. Shecarried her birdie backpack on her backas she walked through the park.
她背着她的鸟背背包在公园里散步。
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2. Thebirdie backpack was designed to be lightweightand comfortable for long hikes.
这个鸟背背包设计轻便且舒适，适合长途徒步旅行。
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3. He decided to buy a birdie backpack as he needed something more durablethan his old one.
他决定买一个鸟背背包，因为他需要比旧的更耐用的东西。