在手工设计计算时要经过多次迭代计算，十分烦琐费时，而应用计算机时，设计计算就很方便有效。
When manual design calculation must undergo many times the iterative computation, very troublesome time-consuming, but using computer time, the design calculation is very convenient effectively.
在手工设计计算时要经过多次迭代计算，十分烦琐费时，而应用计算机时，设计计算就很方便有效。
When manual design calculation must undergo many times the iterative computation, very troublesome time-consuming, but using computer time, the design calculation is very convenient effectively.
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