buffalo
/ˈbʌfələu; `bʌfəlˌo/ n
(pl unchanged or ~es 复数或不变或作buffaloes) large ox of various kinds, including the wild S African buffalo, the tame (often domesticated) Asian buffalo and the N American bison 水牛; （南非或北美的）野牛
fifty buffaloes 五十头水牛
a herd of buffalo 一群野牛.