这些差距很大一部分是由于这些与实际情况不符的假设引起的。
Part of difference is caused by these hypothesizes which are not agree with practice situation.
为了避免由于势流假设引起的不准确性，螺旋桨设计者引入了实效伴流的概念。
To avoid the inaccuracy caused by this potential flow assumption, propeller designers have introduced the notion of the effective wake.
它假设集中管理对于处理人口激增引起的问题——比如有限的粮食供应造成的压力——是至关重要的。
It assumes that centralized management was critical to dealing with issues caused by sudden population surges, like a strain on limited food supplies.
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