Scientists don't know why, but one of Jupiter's two main cloud belts has disappeared — again.
——科学家也不知道为了什么，可是木星上两个主要云带之一已经再次消失了？
Most of the earth's volcanoes are found in two main regions or volcano belts.
地球上的火山大都在两个主要的区域内，或叫火山带内。
The main type of tectonites in the belts of fold thrust - nappes in Ningzhen, Maoshan mountains is the cataclasite series, and then mylonite series.
宁镇，茅山山脉褶皱逆冲一推覆构造带的构造岩类型主要为碎裂岩系列，其次为糜棱岩系列。
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