形容词
中文翻译：未系带的
同义词：
['unfastened', 'untied', 'unbuckled']
例句：
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1. The jeans were unbelted and had a big tear in the knee.
牛仔裤未系带，膝盖处有一个大洞。
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2. The car was unbelted when it hit the guardrail.
车子撞上护栏时，安全带是松开的。
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3. She unbelted her seatbelt and jumped out of the car.
她解开了安全带，从车里跳了出来。