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Pick subject matter that is relevant and timely .

第一步挑选及时且贴切的主题。

But without significant and timely adjustments , our energy dependence will continue to undermine our security and prosperity .

但是，如果没有重大的、及时的调整，我们对能源的依赖将继续影响我们的安全和繁荣。

The most important thing is to be polite and brief -- and timely .

当然最重要的事情是保证有礼貌、简短以及适时。

Mr boot offers a timely reminder to politicians and generals of the hard-earned lessons of history .

boot先生及时地向军政要人提醒了这个得来不易的历史教训。

This was certainly a timely approach .

这当然是个及时的措施。