目前常见的微球编码方法有化学编码和物理编码两大类，但在应用中仍存在诸如编码稳定性、反应兼容性和成本等方面的问题而受到限制。

The present microbead encoding methods include chemical and physical encoding, but both of them are limited in application because of such problems as code stability, reaction compatibility and cost.

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在某种意义上，替换矩阵是对化学属性的编码。

In a sense, substitution matrices code up chemical properties.

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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。

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

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