在UML 2.0中，只定义了三个规范性层次，那些对应于分级语言单元的层已经在0层中就被提及并描述了。

In UML 2.0, only three levels of compliance are defined, and those correspond to the hierarchical language unit levels already mentioned and depicted in 0 earlier.

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项目的分级是这样的，及格分数为50%和70% +表示区分层次的工作。

The grading of projects is such that the pass mark is 50 per cent and 70 per cent + indicates distinction level work.

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从进校大学英语分级考试后组成的三个层次教学级别中分别选出实验组和控制组共334 人。

The subjects of this research are 334 non-English major freshmen from three levels of Huazhong University Science and Technology.

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