重点讲解：

1. keep sth. under wraps 保密，秘而不宣（常指待日后宣布）；

The bids were submitted in May and were meant to have been kept under wraps until October.

标书5月份递交，本欲10月份才予以公布K*+,,WIComD7。

2. plunge into （使）突然陷入；（使）突然遭受；

The country plunged deeper into recession.

那个国家进一步陷入经济萧条之中nSLs5Uab#M%^S|MK。

3. at war 战争；战争状态；

They've been at war for the last fifteen years.

最近15年来他们一直在打仗&a*~9^DRo!。

4. speed up (使)(某一过程或活动)加快；

I had already taken steps to speed up a solution to the problem.

我已经采取措施加快解决该问题@(E6H6yLZJWJbHu%D|uE。