| |||
annelism | |||
annulate | |||
circular structure | |||
ring formation | |||
atoll structure; ring structure | |||
annular structure; annulation; ring-shaped structure |
环状构造 : 8 phrases in 4 subjects |
Earth sciences | 2 |
Hydroelectric power stations | 1 |
Oil / petroleum | 3 |
Technology | 2 |