未知之音素：探秘未知的语音频谱

unknown的音素: /ˌʌnˈnəʊn/

The new sales director is still a bit of an unknown quantity.

新来的销售部主任大家还不大了解。

He was an unknown painter one year ago.

一年前，他还是一个不为人知的画家。

The director cast her in a leading part when she was a young unknown of 16.

当她还是一个十六岁的无名少女时，导演选中她演主角。