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1·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.

该量表从语言学习通道的平衡性及语言学习能力的层次性这两个维度来评估儿童的语言学习能力。