He said he is not worried about the long-term supply of rare earth materials.

他说，他并不担心稀土材料的长期供应。

The footprints were made of extremely fine earth material and could easily be damaged.

这些足印是由极其精细的泥土制成，极易损坏。

He told the Associated Press that the study was " robust" and " debunks" concerns about running out of rare earth materials.

他告诉美联社，这项研究是“强有力的”，并“揭穿”了人们对稀土材料耗尽的担忧。

He said even with evidence that there are enough rare earth materials, humans should still be concerned with creating less pollution.

他说，即使有证据表明有足够的稀土材料，人类仍然应该关注减少污染。

China wants to keep it's dominance in the production of rare earth materials with Japan and India making investments to explore and extract their own.

中国希望保持其在稀土材料生产方面的主导地位，日本和印度则在开发和提取属于自己国家的稀土资源。

So for example, back in 2010, there was a territorial dispute with China, and Beijing retaliated by cutting off some supplies for rare earth materials.

例如，在 2010 年， 与中国存在领土争端，北京通过切断部分稀土材料供应进行报复。