Television and radio transmitters on Earth may soon go dark, replaced by cable,fiber,satellites, and the Internet.

VOA: standard.2010.04.16

Only cells in your brain make the enzymes that produce certain neuron transmitters that are responsible for brain function.

只有脑细胞产生,促进神经传导的相关酶,由此维持大脑功能

耶鲁公开课 - 生物医学工程探索课程节选

The site is home to transmitters for most of the city's television stations, as well as some radio stations, several mobile phone companies and police communication systems.

VOA: standard.2009.09.01