Only the rough guess and estimate can be made of it.
对此只能作出一个粗略的测算。
However it starts with the most pessimistic estimate and then works backward to find a rough guess; and.
然而，这种估算从最悲观的估算开始，然后向后找到一个粗略的猜测。
If we think our estimate is closer to a guess, we will want to develop fewer, say 60 or so, and plan on hiring the rest outside.
如果我们认为这一估计只是一个大概的猜测，我们所需培养的人员更少，比如说60名左右，然后计划从外部雇佣不足的人员。
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