请帮我看看这是什么意思

来源: 于 2010-10-02 23:49:27 [旧帖] [给我悄悄话] 本文已被阅读：次

Note: USPS® Insurance, available at Post OfficeTM locations, provides coverage up to $5000.00 USD. Insurance purchased online cannot be combined with insurance purchased at a Post OfficeTM. Terms and Conditions

我通过Paypal 打标签寄东西，可是不知道从网上买的保险是不是管用。本来E文就不灵光。这个"combined"把我弄晕了。它想表达什么意思啊？谢谢