她用一笔储备金买了一架非常棒的钢琴。

She used ___a ___nest ___egg to buy a really good piano.

她的祖父给她留下了一笔储备金，以帮助她支付大学学费。

Her grandfather left her ___a ___nest ___egg to help with her university fees.

我们正在为退休积累一笔储备金。

We are building ___a ___nest ___egg for our retirement.