It is hard to build a precise math model for counter-gravity casting process for its time lag, uncertainty and complexity.
由于反重力铸造过程的时滞性、不确定性、复杂性，难以建立精确的数学模型。
It is hard to build a precise math model for counter-gravity casting process for its time lag, uncertainty and complexity.
由于反重力铸造过程的时滞性、不确定性、复杂性，难以建立精确的数学模型。
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