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| grass-root level | |||
| background level Term used in a variety of situations, always as the constant or natural amount of a given substance, radiation, noise, etc. | |||
| background level | |||
| base-level | |||
| base level of erosion | |||
| nivel de base: 7 phrases in 6 subjects |
| Communications | 1 |
| Electronics | 1 |
| General | 1 |
| Name of organization | 1 |
| Transport | 2 |
| United Nations | 1 |