1.~ sth解开，松开（皮带、鞋子等）的扣to undo the buckle of a belt, shoe, etc.
Unbuckle your seat belt before opening the door, because you may need to stand up and move to get rid of it once it's in your hands.
开舱门之前，先解开安全带，因为如果舱门需要由你来开，你可能得站起来走动。
Unbuckle the children, starting with the oldest first (who can then help the others).
解开孩子的安全带，从大一点的开始（他们可以帮助其他的）
Unbuckle your pack's waistbelt before starting.
涉水前要解开你的背包腰带。
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