金属的流动发生在金属的塑性变形范围之内，因此在施加的外力去除之后弯曲保持永久的变形。

Metal flow takes place within the plastic range of the metal, so that the bend retains a permanent set after removal of the applied stress.

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那只是在没有施加额外力的情况下。

That's just if there's no additional force being applied.

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在没有施加外力影响的情况下，铅的危害并不大。 但是CELA解释说：“比如，在更新旧的窗户或者钻进墙壁中嵌入绝缘材料的时候，可能使房间受到铅尘的污染。”

The lead poses little threat if undisturbed but "replacing old windows or drilling into walls to blow in insulation, for example, can contaminate the house with lead dust," CELA said.

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