系列简化和假设导致实际物理系统和数学模型之间的差异，主要包括有系统参数变动，未建模动态特性，未建模时滞等等。
The difference between the physical system and the mathematical model arises from many sources, including parameter changes, un-modeled time-delays, and so on.
系列简化和假设导致实际物理系统和数学模型之间的差异，主要包括有系统参数变动，未建模动态特性，未建模时滞等等。
The difference between the physical system and the mathematical model arises from many sources, including parameter changes, un-modeled time-delays, and so on.
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