凯文买了一瓶根汁汽水。用英语怎么说？

凯文买了一瓶根汁汽水。

Kevin buys a root beer.

Kevin

n. 凯文；

例句
In the final seconds, Gunn goalie Kevin Cantwell blocked two shots.
在最后的几秒钟，甘恩队的守门员凯文·坎特维尔扑出了两次射门。

buys

v. 购买，购得( buy的第三人称单数 )，做出牺牲以获得，够支付，买通；

例句
About £35,000 buys a habitable house...
大约花3.5万英镑就能买到一所宜居的房子。

root

n. 根，根源，原因，本质，祖先，[乐]和弦基音；vt. 使生根，使固定，根源在于，欢呼，喝彩；vi. 生根，根除；

例句
...those who see television as the root of all evil.
那些将电视视为万恶之源的人

beer

n. 啤酒，麦酒，（一般）发酵饮料，[印，纺]比尔；

例句
On a table pushed against a wall there were bottles of beer and wine.
在一张靠墙的餐桌上有啤酒和葡萄酒。