whistle jigs to a milestone

• n. 对牛弹琴

whistle jigs to a milestone的用法和样例：

例句

用作名词 (n.)

1. The whistle jigs to a milestone.
   对牛弹琴。
2. To sing for them is to cast pearls before swine.
   为他们唱歌真是犹如对牛弹琴。