由于项目很少会准确地按照项目管理计划进行，因而变更控制必不可少。
Change control is necessary because projects seldom run exactly according to the project management plan.
然而，事实上是这样的，如果你想更有效率地工作，充足地睡眠是必不可少的一部分。
The truth is that if you want to be effective at what you do, enough sound sleep is part of the formula.
同样地，对于讲话的精巧复杂的运动，这是必不可少的。
As such, it is a requisite for the exquisitely complex movements of speech.
因此，不难看出，沟通对于一桩美满婚姻来说是多么地必不可少。
It is not hard to see, therefore, how essential communication is for a good marriage.
因此，不难看出，沟通对于一桩美满婚姻来说是多么地必不可少。
It is not hard to see, therefore, how essential communication is for a good marriage.
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