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

I don't know where that is, that disappeared on the blackboard, then putting the time equal to 1 second into this formula.

我不知道我写在哪儿了,已经不在黑板上了,然后把时间等于1秒代入方程

耶鲁公开课 - 基础物理课程节选

Today we'll do the first way, and then next time we'll do the second way.

证明这个式子，今天讲一个，下次再讲一个。

麻省理工公开课 - 热力学与动力学课程节选

The researcher then shows the video a second time, instructing the audience to forget about counting the passes and just watch the scene.

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Test cricket's all-time leading run-scorer moved to 47 with a delightful punch to the point boundary but then fell to White, for the second time this series, in uncharacteristic fashion.

BBC: Kumble bows out with Delhi draw

If a score occurs on the first minor, the remaining time is then erased and the second two-minute period begins immediately.

BBC: Ice hockey