浆纱机经纱退绕张力控制系统缺乏精确的数学模型，且具有非线性和时变性的特点。

Warp unwinding tension control system for sizing machine lacks an precise mathematical model, and has nonlinear and time-varying Characteristics.

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(活组织)缺乏正常张力的。

(of living tissue) lacking normal tone or tension.

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缺乏市场机制的区域循环经济必然使其缺乏应有的区域合作张力。

Regional circular economy of lacking market mechanism must lead to lack regional cooperation power.

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