每一块金牌必须达到含金量不少于6克的强制性要求。
Each gold medal will have a mandatory requirement of 6 grams of gold.
禁止生产、销售不符合国家技术规范强制性要求的农业机械产品。
No agricultural machinery products that do not meet the mandatory state requirements for technical specifications may be produced or sold.
例如，目前将要出现的外部模型和模型转换的理论，它强制性要求一个模型语言如何来定义。
For example, there are now emerging theories of meta-modeling and of model transformations, which impose certain demands on how a modeling language should be defined.
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