PURPOSE: textbook teacher, including a teaching method are provided to maximization learning effect, are student. ;CONSTITUTION: teaching tip (20) proposes a kind of educational class for being suitable to indicate that direction and passes through the corresponding page (10) according to class to student. Polarizing coating (30) is attached to upside teaching tip. The side of polarizing coating, which is opened, is not attached to teaching tip when polarizing coating is connected to upper side teaching tip. ;The 2011 of copyright KIPO submissions
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