under wraps

adj. 秘密的(不到时候不让露面, 不准许自由活动)

例句与用法：

I hear there's going to be a price increase soon, but keep it under wraps or everybody will buy them up.

我听说很快就要涨价了，不过要保密，否则大家会把它们全买光的。

The documents will stay/be kept under wraps for ten more years.

这些文件要再保密十年。

The plans for the new space mission are still under wraps.

新的太空宇航计划仍未公开。

词形变化：

异体字: underway |

详细释义：

不公开的

The plan was kept under wraps.

这项计划是保密的。