Yet it can become less effective as the disease progresses.

VOA: special.2009.02.03

But we also need it to become effective citizens.

然而我们也需要劳动力变成高效的公民。

麻省理工公开课 - 媒体、教育、市场课程节选

He says many don't even have the active ingredients in them. There is a tendency to treat all fevers as malaria in West Africa,and resistance to otherwise effective treatments, like cloroquine, has become a problem.

VOA: standard.2009.04.25