Play two notes apart from an octave by tongue blocking.
舌堵法同时吹奏差八度的两个音符？
Tongue Blocking is an important technique. However start with lip blocking, it is easier to manage. The lessons will guide you.
舌堵法是重要的技巧，不过还是从纯堵法开始吧，这样更容易些。这里的教程会有详细的讲授。
Those of you who have been using the puckering method until now will most probably want to change to the tongue blocking technique once I have finished this section.
你们当中那些目前为止一直使用单孔奏法的在我结束本节后，很可能会有向多孔奏法转型的想法。
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