billy 为人名William 昵称。来自英语词汇中的一种用人名代替各种叫不出名字或没有合适名字的物件，如jack, 杰克，千斤顶。
英文词源
billy (n.)
"club," 1848, American English, originally burglars' slang for "crowbar;" meaning "policeman's club" first recorded 1856, probably from nickname of William, applied to various objects (compare jack, jimmy, jenny).
实用例句
1. Billy Sullivan had impressed me as a fine man.
比利·沙利文给我留下的印象是他是个很不错的人。来自柯林斯例句
2. If you're a Billy Crystal fan, you'lllove this movie.
如果你是比利·克里斯托的影迷，你会喜爱这部影片。来自柯林斯例句
3. Billy tends to keep things to himself more and shut himself off.
比利往往更多地将事情藏在心里，把自己封闭起来。来自柯林斯例句
4. He had asked around and learned that Billy was not yet here.
他四处询问，得知比利还没到这儿。来自柯林斯例句
5. Billy Bonds has never been one to avoid a scrap.
