没错，就是进口和出口的比例，如果一个国家，进口极少，出口极多，那说明对美国有不公平的贸易壁垒啊。

来源: 咲媱于 2025-03-19 12:58:44 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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