onion可數(shù)還是不可數(shù)名詞

　　It is made with fresh minced meat, cooked with onion and a rich tomato sauce.

　　這道菜用鮮肉沫加洋蔥和濃郁的番茄醬做成。

　　Mix the meat with the onion, carrot, and some seasoning.

　　把肉和洋蔥、胡蘿卜及一些佐料攪拌在一起。

　　Fry for about 4 minutes, until the onion has softened.

　　煎4分鐘左右，直到洋蔥變軟。

　　Will you chop an onion up for me?

　　你能幫我把一個洋蔥切碎嗎？

　　Cut the onion into paper-thin slices

　　把洋蔥切成極薄的薄片。