讲解：
take part (in sth)
参与某事
How many countries took part in the last Olympic Games?
有多少国家参加了上届奥运会？

break out (战争、打斗等不愉快事件)
突然开始；爆发:
They had escaped to America shortly before war broke out in 1939.
1939 年战争爆发前不久他们逃到了美国。

on the back of sth
由于(某项成就):
The profits growth came on the back of a 26 per cent rise in sales.
利润增长来自百分之二十六的销售额增长。

afford sth
买得起；(有时间)做,能做:
Can we afford a new car?
我们买得起一辆新车吗？

roll on...!
…赶快到来吧:
Roll on Friday!
星期五快来吧！