The true challenge of this project was to take the existing reference counting system and move it over to the mark and sweep model in the existing code base without breaking old content.
这个项目真正的挑战在于替换：必须在已有代码基础上，把引用计数系统整个换成标记-扫描系统，而完全不破坏过去的内容。
The metaphor describes the broad sweep of the project, while stories are used to describe individual features.
隐喻用于描述项目全面的面貌，而Story用于描述个别具体的特征。
The metaphor describes the broad sweep of the project, while stories are used to describe individual features.
隐喻用于描述项目全面的面貌，而Story用于描述个别具体的特征。
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