在这个系统中，每一层、每一级都有不尽相同的规范化要求与标准。
In the system, each level has its own special standardization demand and norm.
研究人员把这些患者与另一个相同年龄层的健康“控制组”做比较。
They were matched with a "control", teenagers of the same background who were otherwise healthy.
研究人员把这些患者与另一个相同年龄层的健康“控制组”做比较。
They were matched with a "control", teenagers of the same background who were otherwise healthy.
应用推荐