This fact means that one strategy for obtaining powerful high notes is for the singer to open the mouth as wide as possible, as in belting or calling.

• 意思就是说，要产生洪亮高音的一个方法，是歌者要尽可能的张大嘴巴，例如贝尔汀唱法（belting，以胸音唱高音域的方法），或高声呼唤的时候。