a spirit of a dead person, sometimes represented as a pale, transparent image of that person

something that is pale or weak and without a clear shape

He watched the misty wraiths of moisture making patterns on the window pane. 他看到朦胧的湿雾在窗格上结出不同的图案。

Her wraith of a voice (= her weak voice) gave the songs a moving quality. 她淡淡的嗓音使歌曲听起来更加动人。