成本和时间目标的概率 Probability of achieving the cost and time objectives
航空公司可能也很难协调客机的起飞时间和目的地，使它们能够从编队飞行中获益。
It might also be hard for airlines to co-ordinate the departure times and destinations of passenger aircraft in a way that would allow them to gain from formation flight.
有目的的人可以通过一座狭窄的桥，而植物和动物的缓慢扩散则需要一条像大陆一样的道路，而且需要很长时间才能使用。
Whereas purposeful men could make their way across a narrow bridge, the slow diffusion of plant and animals would require an avenue as a continent and available for ages at a stretch.
这个俱乐部发展迅速，成员人数达到180名，参加项目的孩子们赢得了几个州冠军，在这之后，她决定把自己所有的时间都用来培养和发展俱乐部。
The club grew quickly and when it reached 180 members and the kids in the program won several state championships, she decided to devote all her time to cultivating and developing it.
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