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Guarding Uncle Sam's Borders
| 题名： | Guarding Uncle Sam's Borders |
| 正文语种： | 英文 |
| 关键词： | NULL |
| 摘要： | Thousands of miles of sea and land frontier ceaselessly patrolled to keep out prohibited articles and collect duties. |
| 出版年： | 2019 |
| 期刊名称： | Popular Mechanics |
| 期： | 3 |
| 页码： | 58-61 |
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