phonetic notation的用法和樣例：
例句
- I did not know about the Wade-Giles or the zhu yin phonetic system to help in recognition and pronunciation.
我並不熟悉如何通過注音符號去辨認方塊字及學習發音。 - The national phonetic alphabet can help primary students understand and grasp the tones of the Chinese phonetic alphabet.
注音符號便於小學生理解和掌握漢語拼音的聲調。
