Six South Koreans were killed when the water in the shared Imjin River rose quickly to twice its usual level.

VOA: standard.2009.09.09

But very quickly we go back to our base level exactly where we were before.

但很快我们会恢复基础水平,和以前的我们一模一样。

哈佛公开课 - 幸福课课程节选

Yeah, you are going to have a spike in your level of wellbeing-- I'm sure you had a spike in your level of wellbeing when you got this acceptance letter, but very quickly we go back to our base level.

没错，你们会感觉极至的幸福-,我肯定拿到录取信时,你们的幸福感也达到峰值，但很快又恢复到基础水平。

哈佛公开课 - 幸福课课程节选

World Health Organization Director-General Margaret Chan said the alert level was stepped up because influenza viruses are unpredictable and can spread quickly around the world.

VOA: standard.2009.04.29