to unfasten a belt/button, etc.
解开皮带、纽扣等
牛津词典
When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt...
特德六岁的时候，我们认为他得知道如何系上和解开安全带了。
Reaching down, he unfastened the latch on the gate...
他伸手打开了门闩。
Can you unfasten the lock catch of a box?
你能解开箱子的锁扣 吗 ?
《简明英汉词典》
May I unfasten my seat belt now?
我现在可以解开安全带了 吗 ?
期刊摘选
You can unfasten your seat belt now.
现在您可以松掉安全带了.
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Please unfasten your jacket and shirt and let me listen to your heart and chest.
请解开你上衣和衬衫的纽扣,我来听听你的心肺.
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Is it all right to unfasten my seat belt?
没有系安全带可以 吗 ?
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Please unfasten your jacket and shirt and let me examine your heart and chest.
请解开你的上衣和衬衫纽扣,我来听听你的心肺.
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Please unfasten your safety belt now.
现在请解开安全带.
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She not very unfasten Ni too!
她也不太了解你!
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Now you can unfasten your safe belt.
现在您可以解开安全带了.
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Because does not say a day two days can unfasten go the opposite's together!
因为不说在一起一天二天就可以了解到对方的!
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Do not unfasten the seatbelt before the plane stops completely.
在飞机纯粹停止前,不要松开安全带.
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Is it all right unfasten my seat belt?
好吧.我系.不系安全带是违法的.对吧?
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Who Wants to Unfasten the Screw of Fixed Exchange Rate of RMB?
谁想松动人民币汇率管制的螺钉?
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You may unfasten your seat belt now.
现在可以松开您的安全带了.
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You may now unfasten your seatbelt.
您现在可以解开安全带.
期刊摘选
When Ted was six we decided that he needed to know how to fasten and unfasten his seat belt.
特德六岁的时候，我们认为他得知道如何系上和解开安全带了。
柯林斯例句
"unfasten your belt"
"The shoelaces unfastened"
