因此，不同时代的教师教学观念都不可避免地带有时代的烙印，具有不同的特点。
The author of this paper depicts the historical development by the clue of main features of teachers' teaching ideas.
因此，不同时代的教师教学观念都不可避免地带有时代的烙印，具有不同的特点。
The author of this paper depicts the historical development by the clue of main features of teachers' teaching ideas.
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