a tidy sum的用法和樣例：
例句
- It was a bit of a shock to be declared redundant, but since I had a tidy sum of money saved I was not unduly anxious about finding another job immediately.
被宣布解僱頗令人震驚，但是由於我存了相當大的一筆錢，我並不為立即另找工作而憂心忡忡。 - She's put aside a tidy sum for her retirement.
她存了一筆相當可觀的錢以備退休之用。
