onion

洋葱、葱头

She chopped an onion and fried it with garlic.

她切了一颗洋葱，和蒜头一起下锅炒。

洋葱指植物

We planted onions along the edge of the vegetable garden.

我们沿著菜园边种了一排洋葱。

内行、在行口语、旧式

Ask the old mechanic instead; he really knows his onions.

去问那位老技师吧，他真的很内行。