名词 popgun:

1. plaything consisting of a toy gun that makes a popping sound

popv.发出(砰的响声)；取出；突然行动；突然出现；爆开；睁大；开枪n.流行音乐，流行艺术；爆裂声；<美口>爸爸adj.通俗的；流行的；热门的Popot波波

1. The most widely used large energy source is the air gun.
   应用最为广泛的大的能量源是空气枪。
2. Stilwell promised his brother a pneumtic gun on his birthday.
   史迪威在他弟弟过生日的时候应许给他一支气枪。