And schools will often recognize a new club or activity if enough students are interested.

VOA: special.2009.08.07

There are 100 of these molecules, when a receptor gets activated a kinase activity gets activated, the kinase acts on the protein, the protein gets switched on, something new starts to happen inside the cell.

有一百个这样的分子,当受体被激活,激酶被激活后,激酶作用于蛋白,使蛋白活化,细胞中就会发生一些新变化

耶鲁公开课 - 生物医学工程探索课程节选

He says his team showed the effects of a new process to understand what happens in the Pacific's warm waters where there is a maximum of solar activity.

VOA: special.2009.09.29

Flying was a new and exciting activity in the early nineteen twenties.

VOA: special.2010.05.26

It is hoped that the new structure will end months of civil unrest that killed more than 100 people and paralyzed economic activity.

VOA: standard.2009.03.20

Turning the Page for us refers to the HIV prevention research world really entering a new period in its activity, That new period comes 30 years into the HIV/AIDS epidemic.

VOA: standard.2010.07.15

Last week saw positive U.S.economic news, with increases in home sales and housing prices, a jump in manufacturing activity, a drop in new jobless claims, and a new growth figure showing the economy shrinking far less than had been anticipated.

VOA: standard.2009.08.02