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

But cutting is something fearful and forceful; it's a kind of controlled violence. Frost takes it for granted that we will remember that the scythe is a conventional image for time, which harvests all of us in death.

但是割草是很有力的也是很可怕的;,这是一种控制中的蛮力，弗罗斯特认为,我们将把镰刀作为时代的产物记住，镰刀一直收获直到我们死去。

耶鲁公开课 - 现代诗歌课程节选

But cutting is something fearful and forceful; it's a kind of controlled violence. Frost takes it for granted that we will remember that the scythe is a conventional image for time, which harvests all of us in death.

但是割草是很有力的也是很可怕的;,这是一种控制中的蛮力，弗罗斯特认为,我们将把镰刀作为时代的产物记住，镰刀一直收获直到我们死去。

耶鲁公开课 - 现代诗歌课程节选