名词

1. 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.

1. an aromatic flavorful vegetable

2. bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb

Synonym: onion plantAllium cepa

3. the bulb of an onion plant