天文学家并不知道这一现象发生的具体原因，但是南赤道突然消失并非史无前例。
Astronomers aren't exactly sure why this happens, but the flightiness of the SEB is actually not unprecedented.
包含南赤道带的木星云就不见了，天文学家说，云层它们只是被氨冰组成的白云所遮盖，漂浮在高于明显、带状棕色的云层的空间里。
Astronomers say they're simply being obscured by white clouds of ammonia ice, which float at higher altitudes than the belt's prominent brown clouds.
天文学家们注意到土星的赤道附近有一个大白斑。
天文学家们注意到土星的赤道附近有一个大白斑。
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