暗环 [
àn huán]
[天] Crape ring
[天] dusky ring (土星)
- 他们看到它的周围有九个薄而暗的环。
They saw nine very thin, dark rings around it. - 因此,环绕着中央点将会有整整一系列同心亮环和暗环。
Accordingly, a whole series of concentric bright and dark rings will surround the central spot. - 这样,有90%以上的光落在第二暗环所包围的圆面积之内。
Thus more than 90 per cent of the light is contained within the circle bounded by the second dark ring.