再造工程项目的目标是重新构造遗留软件系统，以便提高一些质量属性。
The goal of a reengineering project is to restructure a legacy software system so that some of its quality attributes are improved.
当氧耗尽时，在方铁矿中遗留下氧耗尽的空洞，形成眼球状构造。
When the oxygen was consumed up by the wustite, some holes remained and showed eyeball structures.
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