Pandemic experts explain a second wave does not necessarily entail any change in the composition of the virus.

VOA: standard.2009.09.04

Sometimes second messengers collect signals from a variety of different receptor systems, translate them into one kind of internal change, and the cell then just has to know about that one thing changing.

第二信使分子能够收集,来自不同受体系统的信号,将它们转化为同一种细胞内在的变化,这样细胞就只需对一种变化作出反应

耶鲁公开课 - 生物医学工程探索课程节选

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