Mother used to pickle onions.是什么意思？

Mother used to pickle onions.

妈妈过去常腌制洋葱.

mother

n. 母亲，妈妈，女修道院院长，大娘；vt. 像母亲般地照顾，养育，溺爱；

例句
I felt I had adjusted to the idea of being a mother very well...
我感到自己已经完全接受了当妈妈的想法。

used

adj. 用过的，习惯于，二手的，旧的；v. 使用（ use的过去式和过去分词），常常，经常；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

pickle

vt. 腌渍（泡菜等）；n. 腌菜，泡菜，腌制食品，遇到麻烦，处于困境；

例句
Select your favourite fruit or veg and pickle them while they are still fresh...
挑选最喜欢的水果或蔬菜，趁着新鲜把它们腌起来。

onions

n. 洋葱（头）（ onion的名词复数 ），（食物）洋葱，葱头；

例句
Chop the onions very finely...
把洋葱切碎。