instructive，instructional
这两个词都是形容词，都具有教育的意思，但涵义并不相同。
Instructive的意思是富有教育意义的（giving or containing instrution），此外，尚可表示有益的、增益智慧之意。例：
The Brave Filipino Maid-Mariais an instructive article．
勇敢的菲佣玛丽亚是一篇富有教育意义的文章。
Prof．Zhang gave an instructive lecture at the Hong Kong Polytechnic University yesterday．
张教授昨天在香港理工大学作了一个与人教益的演讲。
Instructional的意思是教育的或属于教育的，其意相当于 educational.例：
English-A Modern Course is an instructional book．
《英语现代教程》是一本教科书。
This is an instructional film．
这是一部教育电影。
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