DNA marking technology provides methods for studying the genetic materials of foreign breed chickens, and it is also the important references for selecting broiler breeds and crossbreeding.

DNA标记技术为探讨外来鸡种的遗传资料提供了手段，对引进品种的选择和如何配套生产有重要的参考价值。

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Develop packing, packaging, and marking methods and procedures to protect and control the quality of products and packaging materials.

制定包装、包装材料和标记的方法和程序，以保护和管理产品和包装材料的质量。

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The manufacturer shall control packaging, packaging and marking processes (including materials used) to the extent necessary to ensure conformance to specified requirements.

制造业者应对包装、装箱及标识过程（包括所用材料）作必要的控制确保符合规定要求。

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That statistic grossly under represents the huge amount of work that most teachers put in outside the school day (preparing class materials, marking papers, etc).

ECONOMIST: Letters