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Beyond the cloud's unusual shape, scientists see the nebula as a freeze-frame in the life of a star facing its final act. Elderly stars shed their outer layers in bursts, creating shells of gas and dust that expand. By observing the nebula at different wavelengths, researchers can sort out what material was molted first, how fast the star is losing mass, and which phase of decline Webb has caught.
are to copy and to extend (append), with "slicing" being common enough that，更多细节参见旺商聊官方下载
Lily JamaliNorth America Technology correspondent, New York，更多细节参见51吃瓜
（二）从海关取得的海关进口增值税专用缴款书上列明的增值税税额；