 |
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| one in a thousand | |||
| rare as hen's teeth; rare as rocking horse shit | |||
| very scarce | |||
| very rare | |||
| scarce as ice water in hell | |||
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| exotic (Among the exotic kinds of nuts are the bambarra groundnut from tropical Africa, the Chile hazel... I. Havkin) | |||
| очень редкий: 19 a las frases, 9 temas |
| General | 6 |
| Hidrología | 2 |
| Makárov | 3 |
| Matemáticas | 1 |
| Medicina | 1 |
| Náutico | 3 |
| Oceanografía y oceanología | 1 |
| Programación | 1 |
| Proverbio | 1 |