It must have cost a tidy sum.

这准花了相当大的一笔钱。

That must have cost you a tidy sum.

我被引到一间很整洁的起居室里。

He's earned a tidy sum from his business.

他做生意赚了相当可观的钱。

He's put aside a tidy sum for his retirement.

他存了一笔相当可观的钱以备退休之用。

She's put aside a tidy sum for her retirement.

她存了一笔可观的钱已备退休之用。