成本和盈利值：为了维护对整个项目周期开销的控制。
Cost and earned value: To maintain control over expenditures throughout the project lifecycle.
自从污染物被天气控制以后问题的关键就是劣质空气的周期是否与户外奥运会项目的那几天相一致。
Since it's controlled by the weather, it will be a matter of luck whether the bad air periods correspond with days of outdoor Olympic events.
所以批准和控制周期需要和项目的周期一样。
So the approval and steering cycle has to be in the same cyclical tempo as the projects underneath.
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