What do traffic lights, remote control devices and cell phone displays have in common?

VOA: standard.2009.12.13

So probably the, the most common example of Bio-Engineering is stem cell research,

可能最常见的生物工程案例就是干细胞的研究了，

干细胞和伦理 - SpeakingMax英语口语达人

She says computers and cell phones are already very common household items.

VOA: standard.2009.09.28