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| 英语 词库 | |||
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| PFS (USPS temporary forwarding service: 2 year experiment started in 2005 that uses Priority Mail to forward mail to residential customers away from their main address for two weeks up to one year. Customers pay an enrollment fee of $10 plus a weekly per-shipment charge of $10, program permanent in 2008) | |||
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Premium : 387 短语, 29 学科 |
| 一般 | 14 |
| 人口统计学 | 1 |
| 会计 | 8 |
| 保险 | 71 |
| 养鱼（养鱼） | 4 |
| 农业 | 75 |
| 劳动法 | 4 |
| 化学 | 2 |
| 商业 | 1 |
| 商业活动 | 1 |
| 国际货币基金组织 | 18 |
| 安全系统 | 1 |
| 微软 | 5 |
| 房地产 | 4 |
| 政治 | 5 |
| 教育 | 1 |
| 法律 | 3 |
| 环境 | 3 |
| 社会学 | 1 |
| 社会科学 | 3 |
| 经济 | 30 |
| 统计数据 | 3 |
| 自然资源和野生动物保护 | 1 |
| 营销 | 3 |
| 财政 | 97 |
| 运输 | 8 |
| 通讯 | 14 |
| 钻孔 | 1 |
| 银行业 | 5 |