LOM defines a Base schema that defines a hierarchy of data elements for learning objects metadata.
LOM定义了一个基本模式，这个模式为学习对象元数据定义了数据元素的层次结构。
2
But each way of transmitting and learning is also a hierarchy of accomplishment and aspiration.
而每一种传播和学习也捅死包含有等级性成就的实现和愿望。
3
The scale diagnoses children's language learning ability according to two dimensions: the balance of the development of the auditory and visual channel, and the hierarchy of language learning ability.