vt.解开，松开，打开

原形：unfasten第三人称单数：unfastens过去式：unfastened过去分词：unfastened现在分词：unfastening

Could you help me unfasten this seat belt?
你能帮我解开这个安全带吗？
She carefully unfastened the clasps on her necklace.
她小心翼翼地解开了项链上的搭扣。
He unfastened his jacket and leaned back in the chair.
他解开夹克，靠在椅背上。
The baby managed to unfasten the buttons on his shirt.
婴儿设法解开了衬衫上的纽扣。
Please unfasten your safety harness before leaving the vehicle.
请在离开车辆前解开安全带。
The nurse unfastened the patient's bandages to change the dressing.
护士解开病人的绷带，准备更换敷料。
He unfastened the lid of the treasure chest with a rusty key.
他用一把生锈的钥匙打开了宝箱的盖子。
Can you unfasten the buckle on this backpack for me?
你能帮我解开这个背包的扣环吗？
She unfastened the window and let in some fresh air.
她打开窗户，让新鲜空气进来。
He unfastened the ties securing the parcel and opened it.
他解开捆住包裹的绳子，然后打开了它。