Bell System
| reference system
| Bell System abbr. | |
| telecom. | 贝尔系统 |
| bell system abbr. | |
| busin. | 贝尔系统 |
| reference system abbr. | |
| auto. | 基准 系 |
| chem. | 参比系统 |
| el. | 参照 系统 |
| IT од. | 参考系统 |
| oil | 参照系 |
| space | 基准系统 |
| space од. | 参考系 |
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| 贝尔系统 | |||
| 钟的安装 | |||
| |||
| 美国贝尔系统1984 年解体，现为 AT&T | |||
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Bell System : 33 phrases in 9 subjects |
| Earth sciences | 1 |
| Electronics | 9 |
| General | 1 |
| Metallurgy | 12 |
| Nautical | 3 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 3 |
| Telecommunications | 2 |