(informal)be very knowledgeable about something(非正式)(在某方面)知识渊博的
柯林斯高阶英汉双解学习词典释义
N-VAR
洋葱;洋葱头
An onion is a round vegetable with a brown skin that grows underground. It has many white layers on its inside which have a strong, sharp smell and taste.
例句
Will you chop an onion up for me?...你能帮我把一个洋葱切碎吗?It is made with fresh minced meat, cooked with onion and a rich tomato sauce.这道菜用鲜肉沫加洋葱和浓郁的番茄酱做成。
英汉词典释义
n.
洋葱(头)
We grow onions in the garden.我们在园子里种洋葱。
(食物)洋葱, 葱头
There is too much onion in the salad.色拉中洋葱太多。
英英词典释义
Noun
1. edible bulb of an onion plant
2. bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb