In 1898 Madane Curie and her husband declared that they believe there was something in mature which gave out radio-activity.
1898年居里夫人和她的丈夫宣称他们相信在自然界中存在着放射性物质。
2
With the invention of radio, television and most recently, the Internet and computer games, it seems that reading books is no longer a popular activity.
随着收音机、电视和最近的互联网和电脑游戏的发明，读书似乎不再是一种流行的活动。
3
BAE Systems will develop a new radar warning receiver prototype that can identify radio frequency and communications activity in real time.