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.
这种重资产模式在初期投入巨大，但在价格战进入白热化的阶段，它便构成了难以复制的成本护城河。
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（新华社北京2月27日电 记者韩洁、胡璐、古一平、韩佳诺），更多细节参见safew官方版本下载
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對華逆差超千億美元，默茨首次訪華能否反轉中德「零和」競爭？