onion可数名词（onion可数）

可数兼不可数、 eg: 1 He is really a good onion. 他真是个大好人。

2 An onion a day keeps everyone away. 一天一洋葱，所有人远离我。

3 One medium beef steak with onion and shrimps salad. 一客煎得适中的洋葱牛排加虾色拉。