0 a vegetable with a strong smell and flavour, made up of several layers surrounding each other tightly in a round shape, usually brown or red on the outside and white inside -- 洋葱（头）
You should have seen the onions he grew for the competition - they were monsters!
However, some evidence suggests that household heads with college or postgraduate degrees were paying a higher price on onions, peppers and potatoes than their counterparts.
The concentric spherical shells, the so called "onions," constitute a form of carbon consisting of spherical concentric layers of carbon shells.
While initially unnerving, his probing questions sought to peel away the layers of knowledge like an onion.
