重点讲解：
1. be based on 以…为基础；
例句：And ask yourself how much of that bold prediction is based on reliable numbers and how much is outright guesswork.
并且问问自己，那个大胆的预言多少是根据可信的数据，多少是彻底的臆测R%gZuUhYDMf0sDhk。
2. in terms of 在…方面；从…角度看；根据…来说；
例句：The side effects of this treatment can be devastating in terms of weakness, fatigue and a decrease in quality of life.
这种疗法的的副作用是毁灭性的，表现为体质虚弱，疲乏无力，和生命衰减4wtg[|J1kRZ&CtEnJj。
3. off the top of one's head 不加思索地；来不及思索地；
例句：It was the best I could think of off the top of my head.
这是我一时所能想到的最好的办法kBwX5M*w65R(85ho=。
4. in front of 在…面前(做或说)；当着…的面；
例句：They never argued in front of their children.
他们从来不当着孩子的面争吵(=xGVk.5YmO。