wallah

复数：wallahs

n.usually in combination: person in charge of or employed at a particular thing

"a kitchen wallah"; "the book wallah"

1. The tea wallah served us freshly brewed tea on the train.
   茶商在火车上为我们提供了新泡的茶。
2. She worked as a book wallah, selling books at the market.
   她在市场上做售书的工作。