名词
中文翻译：背带
同义词：
['backpack strap', 'shoulder strap']
例句：
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1.The backpack has a comfortable back strap for easy carrying.
这个背包有一个舒适的背带，便于携带。
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2. She fastened the back strap of her bag before leaving.
她离开前把包的背带扣上。
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3. He adjusted the back strap to make sure his bookbag was secure.
他调整了背带以确保他的书包安全。