广播电视英语短句 第 246 课：无电的环境-3

Professor Irvine-Halliday says many people spend well over one hundred dollars a year on the fuel. 教授 Irvine-Halliday 说很多人每年花费超过 100 美元在燃料上。

When he returned to Canada , he began researching ways to provide safe, clean and affordable lighting. 当他回到加拿大，他开始研究可以提供安全，清洁，便宜的照明设备。

He began experimenting with light-emitting diodes, LEDs, at his laboratory at the University of Calgary in Alberta. 他开始用发光二级管、 LEDS 在卡尔加里大校，他的实验室里做进行实验。

As a professor of renewable energy , he already knew about the technology. 作为可再生 能源的 教授，他了解技术。

Light-emitting diodes are small glass lamps that use much less electricity than traditional bulbs and last much longer. 发火二级管是非常小的玻璃灯泡，比传统灯泡用更少的电量，并且使用时间长。