| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | atomic clock | Western countries | Used for high-precision timekeeping and scientific research | 1 |
| 2 | atomic clock | Western countries | Used for precise timekeeping and scientific measurements | 1 |
| 3 | atomic clock | Western countries | Used for accurate timekeeping and scientific research | 1 |
| 4 | atomic clock | western countries | Used for precise timekeeping in scientific research, telecommunications, and navigation systems | 1 |