它包括教学材料和教学活动的开发；所有教学和学习活动的试验和评价。
It includes development of instructional materials and activities; and tryout and evaluation of all instruction and learning activities.
它包括教学材料和教学活动的开发；所有教学和学习活动的试验和评价。
It includes development of instructional materials and activities; and tryout and evaluation of all instruction and learning activities.
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