packing screw

例句：

1. 1. The packing screwsare used to secure the boxes together.
   这些打包螺丝用来将箱子固定在一起。
2. 2. Thefactory uses a special type of packing screwfor its products.
   这家工厂使用一种特殊的打包螺丝来包装其产品。
3. 3. The packingscrews were difficult to remove, sowe had to call a professional.
   这些打包螺丝很难拆卸，所以我们不得不请专业人士来帮忙。