The increase to level 5 indicates that there is sustained human-to-human transmission in communities in different geographical locations.

VOA: standard.2009.04.29

For any given level of return, you can reduce the risk; for any given level of risk, you can increase the return; sounds pretty good.

给定回报率,可以降低风险,给定风险水平,可以提高回报率,听上去不错

耶鲁公开课 - 金融市场课程节选

And the answer is that-- yes it won't make a difference to our wellbeing but it also doesn't mean that we cannot increase our level of wellbeing.

答案是-,是的，它不会改变我们的幸福水平,但并不意味着,我们不能提升自己的幸福水平。

哈佛公开课 - 幸福课课程节选

Fund Executive Director Michel Kazatchkine warned in a news release even this reduced funding level may not be sustainable unless wealthy countries and other donors increase their commitments.

VOA: standard.2009.11.15

"We want middle school kids to increase their level of achievement in science and math and for their teachers to increase their level of performance in teaching those subjects."

VOA: standard.2010.05.10

"Given the fact that the level of retaliation next year would likely increase, we have protected the market for a significant level of goods and intellectual property rights going forward."

VOA: standard.2010.04.28