It's been four years since he attended IDEX, but Murphy doubts that much has changed.

距离墨菲参加国际防务展已然过去了4个年头，但墨菲却质疑展会的改变。

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The world has changed, he says, because we consumed too much and saved too little.

他说，世界早就变化了，因为我们消费太多，储蓄太少了。

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He says this number has not changed much over the years.

他说这个数字在这几年内没有太大的变化。

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President Vladimir Putin visited the ailing musician in the hospital earlier this year an indication of both the respect Rostropovich has earned as a cultural figure and how much the political landscape has changed since he was exiled from the Soviet Union in the 1970s.

NPR: On Rostropovich: Cellists Remember a Master

Much has changed since he suffered a miserable title defence in Australia, and he admits that the pressure of being a Grand Slam champion took its toll.

BBC: Djokovic the man to beat

On the other, he has changed his justifications for policies, making it much harder for voters to ask (as they usually do in an election): did he do what he said he would?

ECONOMIST: Introduction: How to pick a president | The