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

So the second step is you really need to innovating and evolving.

第二步，要不断创新,并在创新中发展。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

you must step out to go to the bathroom for a second.

你还是得暂时离开一会儿，去一趟洗手间。

I will 课堂 - SpeakingMax英语口语达人

Aldrin was the second man to step foot on the moon during the Apollo 11 mission in July 1969.

VOA: standard.2010.04.15

Second,he says, Lithuania is taking a step forward into the electricity market that he adds,will change the planned system of energy into a market based system.

VOA: standard.2010.01.01

"He was telling me I need to finish second, and he was also telling me 'Don't step on the line,' and he was also telling me, 'Just try to stay close.' They shot the gun and I saw him for about maybe two or three seconds.

VOA: standard.2009.08.21