现在，在ROLLUP中添加第二个分组元素，这一次要使用第二级(quarter)的属性。
Now add a second grouping element to the ROLLUP, using the attributes of the next level, quarter.
在数字防伪系统中，采用“二级关联密钥管理技术”来实现存储分组算法的密钥管理。
In this system, using two-level association key management technology realizes key management of storage grouping algorithm.
对大规模随机试验中测试二级预防时，病人应该根据已知的引发肝癌的危险程度包括基因型和变异类型来分组。
When secondary prevention strategies are tested in large randomized trials, patients should be stratified by known risk factors, including viral genotype and mutations.
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