So,we need to strengthen that foundation." The WMO chief says climate change is a global problem.

VOA: standard.2009.08.30

And so, if you don't do anything to open those muscles up and strengthen your...

所以，如果你不做什么把这些肌肉打开，并且加强你的……

健康生活 - SpeakingMax英语口语达人

So,it is critical to strengthen observation systems in developing countries.

VOA: standard.2009.08.31