exerciseover 控制
释：If you exercise over for something, you control that thing.
例：Can‘t you exercise your influenceover the boy to get him to behave better?
难道你不能对这个孩子严加管教，让他规矩点吗?
in thecourse of 在…期间
释：If something happens in the course of a particularperiod of time, it happens duringthat period of time.
例：In the course of the 1930s steelproduction in Britain approximately doubled.
在20世纪30年代，英国的钢铁产量几乎翻了一番。
stand out ofthe pack 鹤立鸡群
释：If someone or something stands out of the pack, that person or thing is much better or much more important than others ofthe same kind.
例：He played the violin, and he stoodout from the pack.
他演奏了小提琴，在其他乐师中鹤立鸡群。
at best 顶多，充其量
释：If you say something at best, you mean that thing is underthe most favorable circumstances.
例：This policy, they say, is at bestconfused and at worst non-existent.
有人说这项政策往好里说是混乱不堪，往坏里说就是形同虚设。
be obligated to 有义务…
释：If you feel obligated to do something, you feel that it is your duty to do it. If you areobligated to someone, you feel that it is your duty to look after them.
例：Citizens are obligated to defendtheir interests and that of the state.
自觉维护祖国和人民的利益是每个公民应尽的义务。
