Project计划引擎非常复杂，可影响任务开始完成时间的因素很多，以上只是常见的一部分。

Many factors can influence task start and finish dates.

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比如，拥有较大飞机的人，只需要提前24小时提交他们的飞行计划——而不像单引擎飞机之类的较小飞机的拥有者那样需要提前好几个星期。

Owners of larger jet planes, for example, need only submit their flight plan 24 hours in advance - as opposed to weeks in advance for smaller craft like single-engine planes.

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劳斯莱斯集团表示，将开始推行更换特伦特900引擎报废部件的计划。

The company said it will begin a program to replace the affected components on all Trent 900 engines.

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