a sharp whistle.

• 刺耳的笛声

a sharp whistle.的用法和样例：

例句

1. The flute broke into a light lilting air.
   长笛发出一阵轻快的笛声。
2. The long-drawn-out sound of a flute is coming from far to near.
   悠长的笛声由远而近。