Besides the microdots, each batch also contains a unique combination of up to 30 compounds of rare-earth metals.

除了小微粒，每批粘着剂都包含着特异的多达30种稀土的金属复合物。

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In place of combinations of rare-earth compounds, its unique chemical markers are short stretches of DNA, each with different sequence of genetic code.

用特异化学标记的短链DNA取代了混有稀土的复合物，每一个链有不同顺序的基因编码。

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Studies in recent 30 years have shown that some rare earth compounds can effectively improve the characters of processing and service of polymers and vest polymers with new special functions.

最近30年的研究已显示稀土化合物在改进高分子材料加工和应用性能以及赋予高分子材料新功能等方面均具有独特的功效。

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Yixing Xinwei processes and refines rare-earth mineral compounds, which are used in a variety of products from semiconductors to fluorescent lights (see accompanying box).

CNN: China's Rarest Man