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.
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经过三天的自动化邮件谈判，最终成交价锁定在 56,000 美元，比标价低约 4,200 美元，低于 Stuyvenberg 设定的 57,000 美元心理预期。整个过程中，他没打过电话，也没踏进过一家 4S 店。
合并过程：用临时数组，双指针比较两个子数组元素，小的先放入