He says if South Koreans want to really boost their global profile, they need to make greater contributions to international causes, such as poverty reduction or climate change.

VOA: standard.2009.11.05

If this was tetanus, you got this tetanus vaccine when you were young; you get a boost every five or ten years because your antibody levels are starting to fall.

以破伤风为例,小时候,你接种过破伤风的疫苗,每隔五年或十年要再接种一次,这是因为体内的抗体浓度会下降

耶鲁公开课 - 生物医学工程探索课程节选

You could probably find some antigens that don't follow exactly this behavior, but in general, this is the kind of behavior you would see on first exposure to an antigen or vaccine, called the primary exposure, and on subsequent exposure to an antigen or vaccine called the boost.

可能你也会发现,一些抗原并不完全遵循这种模式,但通常来说,在你首次接触一种抗原或疫苗时,都能观察到这种模式,它被称为初次免疫,而接下来的,再次接触抗原或是疫苗被称为增强免疫

耶鲁公开课 - 生物医学工程探索课程节选

The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21