This June the eyes of the football world will be on South Africa when it becomes the first African country to host the World Cup.

VOA: special.2010.04.28

So, when the right signal is received, the right T-cell finds your host cell with a foreign virus in it, the first thing that happens is that this T-cell becomes activated and it starts reproducing, making more copies of itself.

所以 当接收到正确的信号,恰当的T细胞寻觅到,感染外源病毒的细胞时,首先发生的是,T细胞被激活并开始增殖,制造更多自身拷贝

耶鲁公开课 - 生物医学工程探索课程节选

The TV host of the Colbert Report agreed to help the U.S.Speedskating Team when a U.S.bank backed out after declaring bankruptcy.

VOA: standard.2010.02.21