A notional figure of cost helps in determining production costs; speculativeknowledge.
概念上的成本数字有助于决定生产成本;理论知识。
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You can sometimes predict complexity based on speculativeknowledge of the problem domain, but writing code creates new constraints and opportunities that are virtually impossible to predict.
Learn relevant mechanism knowledge and master plenty of speculativeknowledge, which will help to analyze the mechanism and provide strong theoretical basis for the failure cause of control choke.