| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | court surface | Russia | Ice court surfaces are commonly used for ice hockey and ice skating, due to the cold climate and popularity of winter sports. | 1 |
| 2 | space surface | Russia | Space surface is an unattainable frontier, representing the ultimate challenge for space exploration and colonization. | 1 |
| 3 | space surface | Russia | Space surface refers to the environment of outer space, where astronauts conduct spacewalks and interact with spacecraft. | 1 |