Two important working properties of metals are ductility and malleability.

延展性和可锻性是金属的两种重要加工性能。

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All of this proves that we must have a profound study of properties of metals.

所有这一切证明我们必须深入地研究金属的特性。

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Therefore, mechanical and physical properties of metals can be improved obviously.

因此，金属的机械性能及物理性能都得到明显的改善。

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So, this again, takes advantage of those great unique properties of transition metals, which we'll talk about in this course.

这同样也是利用了,过渡金属的独特性质，这个我们在以后的课程里也会讲到。

麻省理工公开课 - 化学原理课程节选

There are however few economically concentrated ores of the metals and their very similar chemical properties make the separation and isolation of individual REs in pure form difficult and expensive.

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