As the lightest constructional material, magnesium alloy has high specific strength, high specific stiffness, good magnetic-shielding ability, good damping ability, and good machinability.

镁合金是比重最轻的结构材料，具有高的比强度、比刚度和良好的磁屏蔽性、阻尼性、切削加工性等优点。

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Shielding plastics is a new type of material of functional polymer.

屏蔽塑料是一种功能性高分子新型材料。

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Analysis of the activated background spectrum shows that natural copper is an ideal shielding material in fast neutron nuclear reactions.

通过分析天然铜的活化本底谱，可以看出它是快中子核反应中的最理想的屏蔽材料之一。

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Neutrons do not, so they escape and go thudding into the shielding material around the reactor.

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