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1·A. CAI becomes an alternative or a supplement to the traditional instruction and enriches instructional material.

电脑辅助教学逐渐成为传统教学的补充教案或者替代方案。

2·Instructional design models can also be used to assess existing educational material and help in everyday planning.

教学设计模型也能用来评价现有的教学材料，对每天的计划都有益处。

3·Then, the thesis spreads the steps of the TBL process, and explains the material instructional events.

然后对该流程中各教学环节分别展开叙述，提出教学过程中涉及的具体事件。