It turns out that for most objects, the direct garbage collection cost is — zero.
对于多数对象来说，直接垃圾收集的成本为零。
Time, cost and quality are the most important control objects of project management.
进度、成本和质量是工程项目管理的三大控制目标。
Time, cost and quality are the most important control objects of project management.
进度、成本和质量是工程项目管理的三大控制目标。
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