Body weight of the three ducks during the wintering season showed a fluctuating variation of two low and two high peaks.

三种野鸭越冬期体重呈现出二低二高的变化形式。

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Instability variation of prestressed force will influence the security of the project, so it is very important to study the fluctuating variation of the force.

预应力的不稳定变化关系到工程运营期的安全性，因而，研究锚固力的波动变化显得非常重要。

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The design and construction of pre-stressed anchor will influence the security of the project, and it is very important to study the fluctuating variation of the stress.

但预应力的不稳定变化关系到工程运营期的安全性，因而研究锚固工程的设计施工显得非常重要。

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