1、觊觎：（书）希望得到（不应该得到的东西）wish to get (what one should not get);covet

2、前怕狼后怕虎：形容顾虑重重，畏缩不前：fear wolves ahead and tigers behind -- be full of fear; be overcautious; be plagued by all sorts of fears; be so full of apprehension that one recoils in fear.

3、前事不忘后事之师：《战国策·赵策一》：‘前事之不忘，后事之师。’指记住过去的经验教训，可以作为以后的借鉴。‘Past experience, if not forgotten, is a guide for the future’-- lessons learned from the past can serve as a guide for the future (Intrigues of the Warring States·Intrigues of ZhaoⅠ).

4、少年老成：原指人虽年轻，却很老练，举动谨慎，现在多指年轻人缺乏朝气。old head on young shoulders; young but mature; old young man; young person lacking in vigour and drive.

5、水泄不通：形容十分拥挤或包围得非常严密，好像连水都不能泄出。be so crowded or closely besieged that not even a drop of water could trickle through.

6、剜肉医疮（比喻）只顾眼前，用有害的方法来救急。cut flesh to cure a boil; use a stopgap to the jeopardy of one's long-term interests (疮：伤口boil).

7、驴唇不对马嘴：（比喻）答非所问或事物两下不相合。donkeys'lips don't match horses'jaws;incongruous; irrelevant:这个比方打得不妥当，有点驴唇不对马嘴。The analogy is rather far-fetched.