It can be hard to identify which parcels are carrying crucial items such as Social Security checks, but USPS and UPS try their best to prioritize sensitive material.
2019年12月四级真题（第二套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
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包裹；邮包
A parcel is something wrapped in paper, usually so that it can be sent to someone by post.