1.trade ideas 交换意见
They say there are few places in this city where young people can hang out for hours and just trade ideas.
他们说，这座城市很少有地方能让年轻人一起呆上几个小时，说说彼此的想法N]Le~Ffap~。

2.in unison 同时；齐声；一致
Sarkozy warned on Monday that the E. U. would act in unison against Russian if its troops do not pull out of Georgia.
萨尔科奇18日告诫称，如果俄罗斯部队不撤出格鲁吉亚，欧盟便要一致对付俄罗斯%XagEEDq-rxxJ&Xy。

3.look back 回首；回顾
As I look back, I see that most of my most vivid memories come from the early times when a lot of this music was new to me.
再回首，我认为记忆中最鲜活的那一部分仍旧停留在当初，我刚开始接触到这些音乐之时Avh4n#i4pye。

4.get behind 支持
The crowd really got behind them and cheered them on.
观众真的很支持他们，很努力地在为他们加油e@y_+Owx9WszaZ.|。