VERB
打开（箱、盒等）；（从箱、盒等中）取出
When you unpack a suitcase, box, or similar container, or you unpack the things inside it, you take the things out of the container.
例句
He unpacked his bag...
他打开了包。
Our guide unpacked a picnic of ham sandwiches and offered us tea.
我们的导游打开装着火腿三明治的野餐盒，并给我们倒了些茶水。