 |
| |||
| one in a thousand | |||
| very scarce | |||
| scarce as ice water in hell | |||
| rare as hen's teeth; rare as rocking horse shit | |||
| very rare | |||
| |||
| exotic (Among the exotic kinds of nuts are the bambarra groundnut from tropical Africa, the Chile hazel... I. Havkin) | |||
| очень редкий: 19 短语, 9 学科 |
| 一般 | 6 |
| 医疗的 | 1 |
| 数学 | 1 |
| 水文学 | 2 |
| 海洋学（海洋学） | 1 |
| 编程 | 1 |
| 航海 | 3 |
| 谚语 | 1 |
| 马卡罗夫 | 3 |