但在九月份，标准局警告说，建立某种制度以追溯和标记来自农场克隆动物的食品是不可能的。

In September it warned that it would be impossible to set up a regime to trace and label food from farms with cloned animals.

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追溯策略必须预先确定，并且应该编进需求管理计划(标准的RUP工作产品)。

The traceability strategy must be defined up-front and should be documented in the Requirements Management Plan (a standard RUP work product).

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世卫组织基本药物标准清单可以追溯到1977年。

WHO model lists of essential medicines date back to 1977.

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